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Why does my MPG gauge lie to me?
My digital overhead MPG gauge says I get 18.4 MPG. But if I calculate it based on the trip meter and gallons of full used, I get 14 MPG. Why are they so far off? FYI the 14 MPG was city driving, I had a tank with 17 MPG highway. I'm hoping with the AIS intake upgrade I just did, the 4" exhaust that's on there and the addition of a chip, I can get some better mileage out of the beast.
The reason I ask is, if I get a Kiwi or other OBDII reader, will the MPG readings I get from it be wrong too? (i.e. be the same as my existing gauge?)
2000 Ford Excursion 7.3, AIS intake, 4" MBRP exhaust, PHP Hydra Chip, Bilsteins (5100 in front and 4600 in back) and x code front springs to be added when I can find the time to put them in.
Last edited by MAArcher; 02-11-2014 at 04:43 PM.
Reason: add question