Does anybody know if chips, tuning boxes and similar make a difference to the trip computer MPG readouts?
I have fitted a box from East Coast Racing to my C5, now the trip computer seems optimistic compared to the fuel needle which is approaching 1/4 tank. The last years driving has shown the guage to be deadly accurate.
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I have a soap on a roap chip for my VW Passat and it screws the mpg computer right up! 70mpg is not unusual. Fabulous. ;)
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70 mpg from the computer readout?
My C5 is showing 47mpg on the screen, guesstimating 45 from the position of the fuel guage needle. The computer always under-read by 2-3mpg before. Only time will tell however.
Give me 2 weeks to test properly. Big tanks take a lot of miles between fillups.
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"70mpg is not unusual." Is that the readout, or do you actually get that number of miles from your gallon?
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No the display misreads with my chip, actual about 45mpg.
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It can change even between VAG engine ie audi VW etc they can react differently (different EMU)
I wouldn't use it as a reson to not get a tnning box though.
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Not sure why but yes, it is true. Since I had a chip upgrade, my Saab 9-5's computer MPG shows about 10% less than it used to, yet actual consumption is unchanged.
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