Originally Posted by Jayjay
I saw better fuel efficient on performance than on street tunes... I was thinking that street tunes was going to give me better mpg. I ran my street on 89 and performance on 91.
Anything 91 will give you better MPG..
really if you do the math... It will cost you About 3 to 4 dollars more per upgrade (87 to 89 to 91).. And each tune will net you better MPG.. Enough to where it will even out..
87 at cheaper gas prices = 91 at better MPG
Mpg is really about cost.. And it evens out.. So run the BETTER tune..