New Caprice - Discussion forums

For about the last 6 months i have noticed the avg MPG drop from about 19.5 to 16.5. what was strange is that the drop happened suddenly and it didn't seem like the range per tank of gas had changed. So the last two fill ups i checked the mileage the old fashion way by dividing the miles by the amount of gallons and i found the car is really getting 21.5 - 22.0 mpg not the 16.5 as the trip computer states. So my question is how dose the trip computer calculate the MPG ? Is there some sort of a fuel flow meter ? is there anyway to calibrate this???

That would be nice to know. My wife’s Tahoe has gone from ~18 MPG when we bought it to about 13 now. It runs fine, and we use the usual premium fuel from the same station all the time. Trying to figure out what’s the deal.

you can do nothing to the factory trip function