Mine is 98 E0 SVT (50100mi)running 92octane gas with mobile1 5W-30
1. mostly stop and go city driving with some moderate speed local driving(up to 40-50mph)-25mpg
2. half highway(up to 80-85mph) half local drive - 29mpg
3.Pure highway drive - not done yet but my guess is over 30mpg
I used to have Mystique with duratec ATX, running 87 octane mobile1 5W-30
I had 26mpg at best on almost pure highway driving and mixed or city driving about 23mpg.
I guess MTX has significantly better gas mileage, if premium gas doesn't do any good on mileage.
