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Author Topic: Use your tachometer to get better gas mileage Back to Topics
Saab93turbo

Champion Author
Washington

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Message Posted: Mar 9, 2014 6:07:34 PM

I found that sometimes on a car with automatic transmission, the car is not driving at the most economical top gear. By suddenly letting off the gas a bit, you can make the car go into top gear.

For example, around 45 mph, the car is sometimes not in to top gear. Know what the tachometer should read in to gear.

In some cars, it may be 60 mph = 2100 rpm or 58 mph = 2000 rpm.
At 45 mph, top gear may be 1600 rpm but not top gear is 2000 rpm.

I don't memorize all of the points except the above speeds and rpm.

[Edited by: Saab93turbo at 3/9/2014 6:07:52 PM EST]
REPLIES (newest first) Post a Reply
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randy3116
Champion Author Tennessee

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Message Posted: Oct 30, 2014 5:38:21 AM

i use my tach when driving rather than my speedometer
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Piper1099
Rookie Author Florida

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Message Posted: Oct 27, 2014 10:20:34 PM

Most vehicles will shift into overdrive between 40 and 50 mph, regardless of engine rpm. Newer transmissions are controlled by electronic solenoids that tell the trans when to shift for the best fuel economy. These solenoids are controlled by the engine control module, which gets it's input from among other things, the vehicle speed sensor.
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GasMiser718
All-Star Author Detroit

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Message Posted: Oct 27, 2014 9:13:25 AM

sometimes driving in the city.
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herbiepopnecker
Champion Author British Columbia

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Message Posted: Oct 26, 2014 10:48:24 PM

sometimes
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SGLuz
Champion Author Modesto

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Message Posted: Oct 26, 2014 7:04:20 PM

No
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randy3116
Champion Author Tennessee

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Message Posted: Oct 24, 2014 5:36:23 AM

my driving is based more using my tach than the speedometer
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jl1rp
Champion Author New Hampshire

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Message Posted: Oct 24, 2014 12:41:23 AM

no
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BCNU
Champion Author British Columbia

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Message Posted: Oct 23, 2014 2:18:04 AM

no
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Mikeyy1960
Sophomore Author Cape Coral

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Message Posted: Oct 22, 2014 3:53:15 PM

no
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contiki
Champion Author Ontario

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Message Posted: Aug 10, 2014 8:23:42 AM

Never............
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Mikeyl
Champion Author Cleveland

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Message Posted: Aug 9, 2014 10:43:41 AM

Don't pound on the accelerator. That will help just as much. A nice gradual startup from a stop is best.
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46chief
Champion Author Indiana

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Message Posted: Aug 9, 2014 10:22:36 AM

I use the tach on my truck to get the transmission to shift to a higher gear. It works.
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carinthuist
Champion Author San Francisco

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Message Posted: Jul 28, 2014 1:32:26 PM

no
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StArrow68
Champion Author Oakland

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Message Posted: Jul 27, 2014 2:45:10 PM

If wanted I can keep the rpm's under 2k and and drive, even entries to the freeway. Then again this morning there were two on ramps where 5500 rpm's gave off a beautiful song!
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Jay4Runner
Champion Author Oakland

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Message Posted: Jul 27, 2014 2:37:08 PM

My 2002 Tacoma is a 5 Speed so I do watch the RPMs.
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Jetta_Pilot
Champion Author Toronto

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Message Posted: Jul 27, 2014 1:29:25 PM

I use my foot on the accelerator pedal to control the economy obtained.
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contiki
Champion Author Ontario

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Message Posted: Jul 19, 2014 7:36:49 AM

Never...........
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 18, 2014 9:42:44 AM

I use and like that feature.
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twt
Champion Author Virginia Beach

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Message Posted: Jul 18, 2014 3:37:37 AM

If your transmission isn't in top gear when driving, you need to have it checked.
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Gabilondo
Champion Author New Mexico

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Message Posted: Jul 17, 2014 9:37:09 PM

Yep, engines all have a magic rpm that is the most efficient.
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Vin63
Champion Author San Bernardino

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Message Posted: Jul 16, 2014 9:55:06 AM

Yes, I try to keep the RPMs at peak torque on my diesels.
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Mikeyl
Champion Author Cleveland

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Message Posted: Jul 15, 2014 7:22:57 PM

I do my best to keep the tachometer as low as possible.
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PaylessKY
Champion Author Kentucky

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Message Posted: Jul 15, 2014 11:08:50 AM

No
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dassfg
Champion Author Fort Worth

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Message Posted: Jul 15, 2014 7:48:47 AM

Yes
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contiki
Champion Author Ontario

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Message Posted: Jul 15, 2014 7:21:04 AM

Never........
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randy3116
Champion Author Tennessee

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Message Posted: Jul 14, 2014 5:36:36 AM

my tach is my primary gauge rather than the speedometer
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contiki
Champion Author Ontario

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Message Posted: Jul 11, 2014 7:19:56 AM

Never......
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 11, 2014 7:00:42 AM

Often the average Driver with an automatic then doesn't pay much attention to their Tach. (engine RPM indicator), just maybe during engine warming on very cold mornings.

I'm driving a compact 4 cylinder automatic most of the time, and at times when merging on a fast interstate, I may hold the tranny manually in 2nd. gear as I ramp up, then shift to 3rd. holding that gearing for an entry at near 75 mph.

My vehicle is good for over 80 MPH. without over revving my engine, using my Tach. as a guide as I blend in to traffic.

Seconds later I select O-Drive (top gear), or sooner depends on right lane traffic speed and what large vehicles are their. Some do run only the limits 55-65 MPH. That makes it much easier to blend into traffic.

The whole problem is todays traffic any lane, is that there is a TREND of too Close Following Distance of Vehicles (grouped close) and some vehicles lack extra power to make the risky blend-in moves, often over caution timid Drivers lose the nerve to Kick Ass and Waste Gas just to merge, I see it all the time!

Those yellow arrow merge ahead caution signs (for right lane traffic) seem to not have any affect on semi drivers grouped close, sometimes 3 or more in line and getting at least 5 above the limits on thru traffic, and there goes "GRANNY" up the Merge on Lane ahead of the Bread truck, and Dough/Dough Dan pulling a wobbling trailer loaded with firewood. Low inflated tires!

Make an appointment You Say, That's an Idea..... Nerve pill.....? x 3 ?

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twt
Champion Author Virginia Beach

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Message Posted: Jul 11, 2014 3:18:27 AM

If you have an automatic transmission, it should always be in the proper gear unless there's something wrong with it.
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counterattack
Veteran Author Los Angeles

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Message Posted: Jul 11, 2014 2:39:35 AM

Interesting. But I have a 4 speed so with regular driving and at a highway speed it usually is in top gear.
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sh1361
Sophomore Author Birmingham

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Message Posted: Jul 10, 2014 7:37:39 PM

The rev counter is just something to look at while you drive.
A vacuum gauge works the best because you are monitoring intake vacuum. The higher the intake vacuum the better fuel milage you can expect.
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contiki
Champion Author Ontario

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Message Posted: Jul 10, 2014 7:13:10 AM

no.........
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traffic cop
Champion Author Boston

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Message Posted: Jul 3, 2014 9:08:19 PM

I'm frankly amused at the presence of a tachometer in cars with automatics, like my 09 Sienna van. And just what am I going to do with the information a tach gives me, when a very good computer makes all the decisions for me?

I'm not complaining, just commenting.
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contiki
Champion Author Ontario

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Message Posted: Jul 3, 2014 6:56:50 AM

Never.........
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andersonns13
Veteran Author St. Louis

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Message Posted: Jun 29, 2014 2:13:45 AM

I suppose I could start doing this...
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OilerFan
Champion Author Tulsa

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Message Posted: Jun 28, 2014 10:17:03 AM

I have a manual transmission, so have used the tach for decades. It makes a difference in mileage. It makes a difference in power, depending upon how you drive in both situations.
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dassfg
Champion Author Fort Worth

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Message Posted: Jun 28, 2014 8:28:10 AM

A tach helps you see where the power curve is for your vehicle
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twt
Champion Author Virginia Beach

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Message Posted: Jun 28, 2014 3:06:28 AM

I do that, on the motorcycle.
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hoopitup2000
Champion Author Virginia

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Message Posted: Jun 27, 2014 6:52:11 PM

Yes . . . .
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GrumpyCat
Champion Author Alabama

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Message Posted: Jun 27, 2014 11:35:11 AM

"Cruise controls are nice, they can save a bit of fuel for the driver that may have a nervous go-pedal right foot. Most C.C. systems are only designed to maintain the correction of the set speed in MPH.(driver's choice)."

Ditto. The CC does not represent the best possible highway MPG, only a reproducible result which a good driver should be able to equal at worst, better at best.

If CC produces better MPG than you get with your right foot then you need to work on your skills. Most likely you are making too many control input changes. dontuknowOH calls it "nervous" which is a good description. In flight training we call it over-control.
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Floridaman2013
Champion Author Florida

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Message Posted: Jun 27, 2014 8:47:29 AM

I use my tach readings when towing so as to keep the speed in the "sweet" spot. Also, I look at it now and then when I feel I didn't put the transmission into "D".
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dontuknowOH
Champion Author Ohio

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Message Posted: Jun 27, 2014 8:41:03 AM

Cruise controls are nice, they can save a bit of fuel for the driver that may have a nervous go-pedal right foot. Most C.C. systems are only designed to maintain the correction of the set speed in MPH.(driver's choice).

They are a automatic form of governor similar to what is used on your utility devices >>>> lawn mower engines, tillers, snow blowers, portable generators and others ETC. More complicated is the automotive type and it has to due with the final drive train speed/MPH speed/travel speed.

There probably are High End vehicles with more elaborate higher tech systems in use today needing an extra ECM brain. I don't know, as far as saving fuel, my opinion is they can, but often don't or that is not their primary function. Drivers extra correct knowledge of using it (C.C.) is what counts for the savings.

Same for the RPM TACH mostly coupled with a STD tranny for better fuel savings. Most multi speed automatic trannies are controlled by the vehicles ECM/sensors as OEM programmed. How about a flashing CEL in your Hood ornament, Hood What? Don't get distracted by read-outs! Risky!!!
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Dennis783
Champion Author Des Moines

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Message Posted: Jun 27, 2014 7:54:59 AM

I have always paid attention to the tach
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reamedatthepump
Sophomore Author Toronto

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Message Posted: Jun 8, 2014 8:24:27 PM

I drive a manual and try to stay around 2000 rpm if driving the same speed.
Will go down to 1500 rpm in 6th.
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contiki
Champion Author Ontario

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Message Posted: Jun 8, 2014 8:31:27 AM

No...never....
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carinthuist
Champion Author San Francisco

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Message Posted: Jun 7, 2014 1:27:57 PM

no
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Boyrr
Champion Author Allentown

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Message Posted: Jun 7, 2014 10:18:15 AM

there should be no need for this with the current generation of adaptive transmissions.
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contiki
Champion Author Ontario

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Message Posted: Jun 7, 2014 8:39:07 AM

No........
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contiki
Champion Author Ontario

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Message Posted: May 30, 2014 6:56:59 AM

no....never...........
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contiki
Champion Author Ontario

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Message Posted: May 29, 2014 7:00:42 AM

Never...........
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