Second tank of gas 25.62 MPG

GNS

Gas gauges and trip computers are skewed towards fooling the driver into thinking that fuel economy is better than it really is. That is why the top portion of the meter takes longer to drop...it's been programmed that way.

Hambone1

Another point to consider, cars sold in America also have a "cushion" of sorts built into gas gauges. If your car is saying you're bone dry, you probably have another 1/2 gallon or so, and even the projected distance until empty is usually low by a little bit. This is so people who try to run it to the edge still don't run out of gas unless they are completely inept

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ImportConvert

Not in my experience. My mpg calculator on my car is slightly pessimistic. It said I got something like 25.6mpg on the highway (averaged both ways for accuracy) when manual calculation revealed 26.0X. That said, I find it hard to believe that 370Z's are not getting 30+ on the highway unless it is at altitude.

I think some of you must be driving up-hill and not noticing it. It's easy to do. I drove across a bridge one time and the read-out showed nearly 30mpg. Then I took it the other way and it sat on 22-23 mpg. Apparently, this 2 mile long bridge was NOT flat/level. It sure looked it, though! Easy to do. Average your mileage going both ways on the same stretch of highway for accurate measurement.

shadoquad

Yeah, whether they round up or down, I've found the trip computers to be wrong on mileage over time.

Doesn't bother me, really.

ImportConvert

That was over @125 miles. I'm with you. .4mpg over 100+ miles? Who cares? You put gas in it when you touch 1/4 tank and that's that. People should stop being such nigglers.