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Author Topic: Does your car have a fuel economy meter? Back to Topics
rick_evans
Champion Author
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
Floridaman2013
Champion Author Florida

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Message Posted: Mar 6, 2015 6:29:37 AM

Yse, 2014 Grand Cherokee and is pretty accurate.
maynard420
All-Star Author Portland

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Message Posted: Mar 6, 2015 3:24:14 AM

Yes
stevo4756
Rookie Author Dayton

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Message Posted: Mar 5, 2015 11:01:07 PM

Factory. Seems to get a very accurate reading considering it probably measures the Air/Fuel ratio and adjusts accordingly.
juniperus98
Sophomore Author Alberta

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Message Posted: Mar 5, 2015 9:12:08 PM

no
clhall87
Rookie Author Orlando

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Message Posted: Mar 5, 2015 2:00:34 PM

yes
Tucsonhomes
Champion Author Tucson

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Message Posted: Mar 5, 2015 12:35:35 PM

One does
searcher625
Rookie Author Ontario

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Message Posted: Mar 5, 2015 11:46:41 AM

very accurate
carinthuist
Champion Author San Francisco

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Message Posted: Mar 5, 2015 10:43:34 AM

yes
some_guy5
All-Star Author Cincinnati

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Message Posted: Mar 5, 2015 9:47:02 AM

yes
weddy11
Champion Author Phoenix

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Message Posted: Mar 5, 2015 8:49:16 AM

Yes, last month it was .7mpg on the high side for my 2013 Honda Fit.
94Rod
Sophomore Author Orlando

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Message Posted: Mar 5, 2015 6:52:19 AM

Yes.
JoeKing
Champion Author Manitoba

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Message Posted: Mar 2, 2015 1:10:03 AM

no
moxxor54
Veteran Author Missouri

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Message Posted: Mar 1, 2015 9:25:32 PM

Yep !
alexhalla
Rookie Author Colorado Springs

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Message Posted: Mar 1, 2015 5:03:37 PM

Yes
BCNU
Champion Author British Columbia

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Message Posted: Mar 1, 2015 12:52:00 PM

no
RASfuel
Champion Author Ocala

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Message Posted: Feb 28, 2015 5:11:35 PM

First fillup on new hybrid meter says 38.3mpg, vs. actual 38.68mpg. Pretty darn close.
BCNU
Champion Author British Columbia

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Message Posted: Feb 28, 2015 1:25:19 AM

no
ShortyT2014
Rookie Author Lexington

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Message Posted: Feb 27, 2015 12:56:38 PM

Factory. It's pretty close to the numbers I get from the pump + odometer.
carinthuist
Champion Author San Francisco

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Message Posted: Feb 27, 2015 10:29:52 AM

YES
hoofharted
Champion Author Wyoming

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Message Posted: Feb 27, 2015 5:32:31 AM

no
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
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