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Old 09-11-2012, 12:51 PM   #1 (permalink)
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Default Discrepancy between computer and mileage calculations

I have a 2010 Insight, which I purchased in May of 2009. One of the early adopters. Living in Florida, you need to have the A/C on all the time, so my mileage has run from 35 to a high of 43 mpg on long highway trips. Or so I thought. I have recently begun to do the actual calculations, checking fuel purchased against actual miles driven and I have found that the automobile's computer overestimates the mileage by about 10%. Has anybody else found this? Is there anyway to re-calibrate the system, so that the calculations are correct?
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Old 09-11-2012, 01:06 PM   #2 (permalink)
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Originally Posted by Scooter View Post
I have a 2010 Insight, which I purchased in May of 2009. One of the early adopters. Living in Florida, you need to have the A/C on all the time, so my mileage has run from 35 to a high of 43 mpg on long highway trips. Or so I thought. I have recently begun to do the actual calculations, checking fuel purchased against actual miles driven and I have found that the automobile's computer overestimates the mileage by about 10%. Has anybody else found this? Is there anyway to re-calibrate the system, so that the calculations are correct?
My Gen I Insight is typically within about 2% over the last two years.

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Old 09-11-2012, 11:23 PM   #3 (permalink)
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The MID is just an est. one must do the actual calculations to determine actual mileage. That is true of vehicles with this feature.

i suggest you keep better track of tire pressures if you are not already. Go ahead raise them up to the limits on the sidewall. (that may be too high for comfort) I run ours at about 38 (I think 33 is the spec) Remember, check pressure with the tires cold. It's best to have your own compressor at home.

My menopausal wife drives our Insight and tends to keep her A/C maxed out out always. She still gets at least 38 MPG. I can't remember what her lifetime MID shows.
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Old 09-12-2012, 03:27 AM   #4 (permalink)
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The MID is about ~1-2 mpg off usually, just calculate it yourself or enter it into fuelly for your own record.

The lowest I've got so far was 36mpg with AC on and city driving, live in central cali which is still really hot. Usually, I average around 41-45 mpg.
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Old 09-12-2012, 05:35 AM   #5 (permalink)
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I've put about 9.5k miles on my UK 2010 Insight ES since August last year. MID shows 50.3 mpgUK average. Calculated from fill-ups is 47.0 mpgUK.

My fuel economy appears to have improved slightly after my last oil change two months ago (which used Mobil 0w20). I suspect the supplying dealer (a Toyota main agent) may have used 5w30 for the service they carried out prior to sale, resulting in a slight hit to mpg especially for shorter journeys over the winter.

For info, most of my journeys are in a hilly area and I run the tyres at Honda's recommended pressure. When I bought the car the trip B computer was showing 52 mpgUK average from the last 6k miles from previous owner (who lived in a much flatter area than me).

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Old 09-14-2012, 09:59 PM   #6 (permalink)
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I know my MID is about 2 to 2.5 mpg gallon off until I hit about 50 to 55 mpg then the higher I go the worse the system tells me. My best tank of 61.2, the MID was showing nearly 66. At the time i thought that I was possibly the normal 2 or so off then I got upset. Last tank was showing 58 and some change when I filled up and it calculated to about 54. I guess I've learned to deal with it. I live in NC and summers can get hot here as well but I guess I've just gotten so upset with gas I leave the A/C off, roll the windows down and take side roads that are about 25-35MPH with no traffic so it works out, fuel mileage, relaxing (sometimes boring) driving. Not sure if your work route will be able to accomodate that.
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Old 09-15-2012, 03:50 AM   #7 (permalink)
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Larger numerical discrepancies at higher fuel efficiency is hardly surprising. You would find the discrepancy doesn't change as much if the car reported gallons per mile. It's all in the maths.

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Old 09-15-2012, 08:31 PM   #8 (permalink)
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The discrepancy is normal in any vehicle that has a MPG device in it but its frustrating. my MID is reading 59.7 at 200 miles right now and I know the fuel gauge is wrong reading that I am down only 1/4 tank and I am probably really getting about 56-57. But I know the difference and its really just a challenge at this point to get it to read over 60 on a tank of gas, only had it once before.
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Old 01-23-2013, 09:58 AM   #9 (permalink)
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Default Mpg

I have tracked all my fuel fill-ups and mileage on an Excel spreadsheet since I bought my car, and have noticed about an 8% discrepancy. To achieve 50 MPG, the car has to show about 54 MPG.
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Old 03-20-2013, 05:12 PM   #10 (permalink)
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with a little under 2,000 miles on the car and i am noticing about 3 to 5 mpg difference from what the readout to hand cal. per tank.
i can not complain to much i been in the mid 40s but i hope to bet hight to low 50s once it is broken in
plan to which to amsoil or royal purple 0w-20 and new CVT-F once it hits 5,000
just to clean anythings that might be floating around in there
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