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Actual MPG vs. Computer MPG

9 messages,  Last post on May 04, 2013 at 9:56 AM

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#1 of 9 Actual MPG vs. Computer MPG by jsganz

Sep 17, 2010 (6:25 am)

Has anyone done a comparison to determine the accuracy of the computer's average mpg readout.
Is it close to the actual mpg figured the old fashioned way?

#2 of 9 Re: Actual MPG vs. Computer MPG [jsganz] by onefunkar

Sep 18, 2010 (7:29 am)

Replying to: jsganz (Sep 17, 2010 6:25 am)
i have and over time its exact. each tank may vary because its almost impossible to fill up exactly the same each time but if you keep track over time it should both match.

#3 of 9 Re: Actual MPG vs. Computer MPG [jsganz] by bet48

Jun 15, 2011 (6:49 am)

Replying to: jsganz (Sep 17, 2010 6:25 am)
The computers average mpg seems right on, but you can not fill up and see the correct hwy milage right a way. Mine after a half tank or so the computer reads out at 22/23 for straight hwy. if you stop and fill up and check the "old fashion way" Yes a am getting 22.7 at best on hwy, sucks since it is suppose to be getting 30 or so. Had my husband take a 100 mile drive on the turn pike, filled up, got on hwy went 50 miles turned around came back, stopped at same station filled up check manually, it came out 22.6. what would make a car get the same city and hwy. sorry i bought it.

#4 of 9 Pretty Close by lazy_bones

Jun 18, 2011 (6:47 am)

My actual mileage and the computer-reported mileage are pretty close. I have the LT2 I-4, and actual is around 26-27 mpg average. The computer reports 26+. I run in the Eco mode, and don't ever expect to see over 27 mpg, and nowhere near the 32 promised.

#7 of 9 Camaros and Tire Pressure by runox

Sep 25, 2011 (1:31 pm)

I routinely get 27-28 on the highway with 4 - AWD and thats going 70-75 mph on 87 octane. I drove from NJ to Ohio in clear and moderate traffic and was pulling 31 going 55-60 on crowded highway I don't drive it like my old Camaro. Starting and stopping with a heavy foot is a MPG killer in these cars. Zoom zoom right in the next filling station.
 
Gypsy gas is also a mileage killer. Feed it Mogen David and you'll have a MD hangover. I've found the best mileage is with Gulf or Sunoco 87 O. Go for the plus and yes you will increase MPG more than the difference in price.
 
The biggest MPG killer I've found is low tire pressure. 30-32 psi which is a considered a tad low but still normal will knock off a minimum 10% mpg. I keep my tire pressure in the 38-40 range, being real careful in the summer heat because 90F+ will boost tire pressure on these wheels 4 psi after 10 minutes.
 
Last, I've noticed these engines prefer moderate temps not summer heat, not winter freeze. Best MPG is when temps are 55-70F.

#8 of 9 Re: Actual MPG vs. Computer MPG [jsganz] by tomsfiretruck

Nov 23, 2011 (9:16 am)

Replying to: jsganz (Sep 17, 2010 6:25 am)
2012 LS Equinox.................MPG
Have taken 2-300 mile trips. City-Interste-State Hwy roads, etc
Have avg about 26/27 mpg on both trips. Need to take a long interstate trip to figure out the full highway MPG.

#9 of 9 actual vs. computer mpg by ralphs42

May 04, 2013 (9:56 am)

I think Toyota and Lexus computers are intentionally to indicate 5-8% better mileage than actual when you compute it over several tanks the old fashioned way. Now two hybrids, same results. Toyota Camry and Lexus HS250h....
 
Anybody out there tested the Ford hybrids? I know the computer says less than epa but is actual less than that?

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