What car is it? 30 mpg is **** good for a v6, youmust do alot of highway driving.
Me a dumbass: 12 gallons of cheap gas @ 2.80 a gallon= $33.6 and getting around 320 miles or so...and thats driving soft and smooth. Never flooring and shifting before 3 rpms everytime.
Me aftet I read about 100 articles on gas 6 months later: 12 gallons of the highest of the high from exxon/shell etc. I believe it was $3.15= 37.18...I got about 420 miles or so... thats a 100 mile difference. I was freaking amazed
Spend the extra 4 bucks or whatever and do the test just once, and you will never turn back. Unless your car sucks of course and eats gas either way.