Hilly30si said:If you show efficiency you anit driving your Z right. The way I cane mine I could never work out mpg on different fuels 97 Ron or 99 Ron. All I know is it's a performance engine and to get the best out of it you use the best fuel.
ps On a recent drive to Wales on my own average was 18 mpgand it was all Mikes fault when in second at 6000 rpm that sound is fantastic.
Lol - I know what you mean, mine averages 19-20 according to the dash, but then again, I don't drive any of my vehicles for economy. so it's not that bad considering the XC90 does around 25mpg, and my van 30'ish - Again all on premium Costco fuel.
Just debating whether to crack open my own exhaust, and "louden" it up some, as I've gotten used to it!
Mike
Why would you do that?

