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Hi all I have monitered my consumtion over three tankfulls against what the trip computer says.

Working out my MPG manualy and comparing this to the cars computer has shown that the computer is very optomistic.

Its varied over the three tankfulls by +3.2, +5.3, +4.7

Over the three tankfulls I'm actually getting 43.2mpg, but on setting B the car is showing 47.0mpg

Is this inaccuracy the norm?

Against ny sat nav the speedo also appears to over read by about 3mph across a wide range of speeds.

Regards all
 

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Well I checked the gearing on mine and done rpm vs speed.

The speed error was 1mph per 1000rpm in any gear.
As for the MPG some are apparently worse at guessing than others.
Check your tyre pressures and tyre size.

Mine is the 2.2 diesel...so yours will probably have a differnet rpm vs mph
 

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I don't know was constantley getting 44-47 MPG then the other day doing similar journey it shot up to 50 MPG and had an A next to the figure, never noticed this before?
 

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On both my Civics - whatever the computer says, take off 4-5 MPG and that is more like the true figure.

SpritMonitor (on the left currently showing 36.9) agrees with my spreadsheet but the trip comp continually puts my MPG in the low 40's.
 

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even the type R?..... oops its worse than i thought.
Even on the R. I worked out my true mpg over a year and each time the trip computer was about 2-3 mpg more than actual. But my mpg is relatively high (36mpg) due to mostly motorway miles so it's possible the less your mpg figure is the less discrepancy the computer figure might have.
 

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On my 1.8 it used to be about 4-5 MPG to high on the trip, but on the Type R doing the same journeys it's within 1 MPG.
 

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On mine it's over-enthusiastic for approx 5-10%.
 

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Mine's usually within about 2 to 3 mpg on a tankful. It claims, say, 47.7mpg, but truly more like 45.2mpg, based on brim to brim.

Appreciate the 1.8 may well be different, and I'd be surprised if they are recalibrated for different wheel and tyre combinations, that generally are all within about 5% of nominal diameter.
 
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