How To Increase Your Gas Mileage

Anatoray

I think you got the wrong car if you're worried about your gas mileage...

As for the Z's computer that calculates the gas mileage, are you talking about the left gauge or the nav computer that records trip mileage? If you're talking about the gauge, then it's not doing anything out of the ordinary. Those types of MPG gauges always fluctute between the low teens and 30s when cruising on the free way. If it's your trip computer though, then I'd have to say it's broken. That only calculates it based on how many miles you actually drive on each gallon, so it should never hit the 30s, unless you're finding a 30 mile decline somewhere.