I've had my Z for about three weeks. I'm averaging around 22-23 MPG with about 75%Hwy/25% City. The worst I've had was 19MPG. The best I've had was 23.5MPG. I have noticed a marked decrease in mileage at anything over 70MPH. If you keep it at 70 or below, I would expect at least 24 MPG avg.
I tried to keep it under control for at least the first 500 miles and waited till it warmed up before I'd hit it hard. I can say the car cruises nicely at about 90MPH. I might also say I've seen 125MPH, but that would be irresponsible. (It still had plenty of power at 125MPH!...and so smooth, it felt like 80MPH in my Acura TSX). I took it on a 200 mile road trip and I have my TomTom set to yell at me if I hit 90MPH plus. The GPS was yelling at me a lot and I still averaged 21.5MPG for the trip.
I now have about 1400 miles and I'm feeling a little more lead in the foot these days. I might have to look into that cool radar detector bracket.
-ZCarGo-
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