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Author Topic: Does your car have a fuel economy meter? Back to Topics
rick_evans
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Boston

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Message Posted: Mar 28, 2011 4:08:10 PM

Factory or aftermarket. If it does, is it a good predictor of your actual MPG?
REPLIES (newest first) Post a Reply
weddy11
Champion Author Phoenix

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Message Posted: Feb 25, 2015 8:58:24 AM

Yes, a factory one. It reads .5mpg on the high side as an average.
BCNU
Champion Author British Columbia

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Message Posted: Feb 24, 2015 4:45:09 AM

no
RF4CPhantom
Champion Author Oklahoma City

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Message Posted: Feb 24, 2015 1:23:50 AM

Yes.
boborobot
Champion Author Michigan

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Message Posted: Feb 23, 2015 6:16:11 PM

yes
carinthuist
Champion Author San Francisco

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Message Posted: Feb 23, 2015 11:37:12 AM

yes
HideMKE
Champion Author Milwaukee

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Message Posted: Feb 23, 2015 11:10:40 AM

no
WEDDY
Champion Author Phoenix

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Message Posted: Feb 23, 2015 8:52:08 AM

Factory. It reads about .5mpg on the high side.
JohnCur
All-Star Author New Jersey

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Message Posted: Feb 23, 2015 12:58:43 AM

Yes for car 1, no for car 2
CaptainAnhyzer
Champion Author Albany

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Message Posted: Feb 22, 2015 9:43:12 PM

Yes
chocolateflash
Champion Author Las Vegas

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Message Posted: Feb 22, 2015 2:41:02 PM

no, no.
carinthuist
Champion Author San Francisco

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Message Posted: Feb 22, 2015 12:16:44 PM

yes
drydem
Veteran Author Maryland

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Message Posted: Feb 21, 2015 11:41:01 PM

The 2010 Prius on board fuel economy meter is about 2 mpg more than the actual MPG when computed manually at each fill up. Not bad....
carinthuist
Champion Author San Francisco

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Message Posted: Feb 21, 2015 11:17:00 AM

yes
badbobKY
Champion Author Lexington

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Message Posted: Feb 21, 2015 5:18:35 AM

yes
8_Ball2014
Champion Author North Dakota

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Message Posted: Feb 21, 2015 3:09:03 AM

no
Gabilondo
Champion Author New Mexico

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Message Posted: Feb 20, 2015 10:42:31 AM

no
carinthuist
Champion Author San Francisco

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Message Posted: Feb 20, 2015 10:41:02 AM

yeah
Mizzer1
Champion Author Worcester

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Message Posted: Feb 20, 2015 12:43:55 AM

Yes
CaptainAnhyzer
Champion Author Albany

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Message Posted: Feb 19, 2015 9:37:41 PM

Yes
dontuknowOH
Champion Author Ohio

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Message Posted: Feb 19, 2015 9:16:49 PM

I still have a vacuum gauge in an older toolbox. Mechanics of past years used one to check on engine breathing condition, for adjusting the carburetors hot idle fine tune balance/idle speed.

The gauge cold tell if a intake valve was leaking back on the intake manifold flow, or a faulty valve operation.

Engines with a high vacuum reading at different RPMs showing steady on those gauges often indicated the valves/rings were in good shape, being tested without normal loads applied.

Under load the same vacuum gauge can help the driver know by sight if the engine is using more fuel, slow spark timing, poor cam/chain wear(lag in degrees)and some degree of engine loading in each gear.

As far as a fuel saver, every time the driver can manage to keep a high reading then often means the throttle is in an economy position V/S the gear load(torque load applied).

Simply when the driver tromps down the Go pedal engine vacuum drops off, fuel/air rushes in to the engine, the gauge shows more fuel/air energy in use >> that as a low reading on manifold vacuum. At heavy torque loads and high RPMs limits (max strain) engines run out of breathing capabilities, performance has maxed out.

Modern EFI systems don't have idle tune adjustments but automatic IAC valve controls, which are work slaves to the ECM "BOSS". The modern fuel economy indicators take more delicate info examined by the vehicle's ECM to give digital readings as MPGs....Whatever mode set.

Only one vehicle of mine has the older crude type, but it works with understanding, like ............. a Woman or Her economy.....!
redfish67
Champion Author Dallas

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Message Posted: Feb 19, 2015 1:44:56 PM

yup
rick_evans
Champion Author Boston

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Message Posted: Feb 19, 2015 12:53:06 PM

"Not a god predictor. It's simply, a vacuum gauge. "

How does your simple vacuum gauge determine your distance for the amount of fuel consumed? I'm confused.
twt
Champion Author Virginia Beach

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Message Posted: Feb 18, 2015 7:27:35 AM

Not a good predictor.
twt
Champion Author Virginia Beach

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Message Posted: Feb 18, 2015 7:27:02 AM

Not a god predictor. It's simply, a vacuum gauge.
CaptainAnhyzer
Champion Author Albany

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Message Posted: Feb 18, 2015 7:17:05 AM

Yea
8_Ball2014
Champion Author North Dakota

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Message Posted: Feb 18, 2015 6:06:02 AM

no
MustangGas1964
Rookie Author California

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Message Posted: Feb 17, 2015 2:22:00 PM

yes. i have a older car that shows miles per tank of gas i like that one more
retiredssgt
All-Star Author North Carolina

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Message Posted: Feb 17, 2015 12:40:35 PM

Yes! Factory fuel economy button on dashboard.
rick_evans
Champion Author Boston

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Message Posted: Feb 17, 2015 10:17:32 AM

@twt -- "It's simply a vacuum gauge. The higher your rpm's, the more vacuum is produced in the intake"

How does a vacuum gauge determine how fast you're moving?

contiki
Champion Author Ontario

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Message Posted: Feb 11, 2015 7:02:22 AM

My wife new car does......
JoeKing
Champion Author Manitoba

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Message Posted: Feb 11, 2015 2:19:02 AM

no
Mikeyy1960
All-Star Author Cape Coral

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Message Posted: Feb 10, 2015 3:19:40 PM

Aftermarket scanguage II pretty accurate once you get a few tanks recorded...
hoochie123
Rookie Author New Jersey

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Message Posted: Feb 10, 2015 12:49:52 PM

factory and fairly accurate.
Les4hdtv
Sophomore Author Alabama

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Message Posted: Feb 10, 2015 12:22:27 PM

yes! Have it in the 13 and 2014.5 Camry. On a 500 mile run to FLA in the 2014.5 LE. The Meter was only off by between 1 and 2 MPG in 480 miles if driving, based on careful calculation.

[Edited by: Les4hdtv at 2/10/2015 12:23:10 PM EST]
carinthuist
Champion Author San Francisco

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Message Posted: Feb 10, 2015 10:28:07 AM

yes
JoeKing
Champion Author Manitoba

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Message Posted: Feb 10, 2015 4:11:11 AM

no
RacksnSpurs
Veteran Author Raleigh

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Message Posted: Feb 9, 2015 11:08:09 PM

no
zippok
Veteran Author Twin Cities

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Message Posted: Feb 9, 2015 5:53:00 PM

yes
Atlknight
Rookie Author Atlanta

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Message Posted: Feb 8, 2015 6:56:34 PM

Just purchased a 2015 Camry and love watching the fuel meter built into the dash. Makes me watch how I drive as well.
redfish67
Champion Author Dallas

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Message Posted: Feb 8, 2015 10:34:36 AM

yup
SAButton
Sophomore Author Atlanta

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Message Posted: Feb 8, 2015 10:25:08 AM

Yes but it's not accurate
dontuknowOH
Champion Author Ohio

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Message Posted: Feb 8, 2015 9:33:03 AM

As far as accuracy, My FEMs do really well, does anyone really want to know about each time you are backing in reverse (using fuel) also or as each time ones maybe backing out a driveway daily for work. That accuracy would add more expense to your vehicle purchase cost, Rocket Science style. I really need that when penny pinching, Right! Love those recycle beverage free cans.....Takes about 17 to = a lb. and no R/Science calculations, JUST KIDDiING. HABetter-Day
8_Ball2014
Champion Author North Dakota

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Message Posted: Feb 8, 2015 2:59:27 AM

no
VWDeeZel
Veteran Author Ottawa

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Message Posted: Feb 7, 2015 8:14:20 PM

Yes...standard equipment.
Mininana
All-Star Author New York

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Message Posted: Feb 7, 2015 11:31:07 AM

to dontyouknowOH, very wise, wind means a lot as I learn when making fast turnaround to city 150 miles to east... all other factors being equal, I'll get like 7 mpg eastbound in the mini, 5 mpg eastbound in the cross trek, over an identical westward trip.... also, it's downhill going east, by about 400 feet above sea level...
Mininana
All-Star Author New York

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Message Posted: Feb 7, 2015 11:29:06 AM

it does well trending but in every aspect it runs consistently 10 per cent lower than what I actually achieve... that is, if I shows 26.4, I'll be closer to 24... but that error is very consistent and always down, so I know, comparatively, how I'm doing
JohnCur
All-Star Author New Jersey

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Message Posted: Feb 7, 2015 10:34:47 AM

no
dontuknowOH
Champion Author Ohio

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Message Posted: Feb 7, 2015 9:48:58 AM

After adopting better economy driving habits, I only pay slim attention to My indicator to get an idea of wind force at highway speed, force either to benefit or hamper my mileage. I also watch it during the cruise on use with slight up/down grades, and how much that is affecting Me to override it's use or turn CC. off.

weddy11
Champion Author Phoenix

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Message Posted: Feb 7, 2015 9:08:20 AM

Yes, It reads an average of .5mpg high.
PaylessKY
Champion Author Kentucky

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Message Posted: Feb 7, 2015 8:38:49 AM

Yes, and sometimes its close.
JoeKing
Champion Author Manitoba

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Message Posted: Feb 7, 2015 3:31:27 AM

no
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