60DRB

I would say below a quarter tank at least. It's more perky, but not 30-40 cents a gallon worth of perky.

"Ok thanks! One more question. If I run 89 will I see any more of a difference?"

Not unless you fiddle with the settings... I wouldn't do that without some study on tuning first.

KingRanch4Life

iTrader: (2)

Definitely not worth it to run premium unless you like spending $150 on a fill up... I get pretty good gains from my custom 87 performance

EFHALL42

Its not much difference in price. Your only talking about a $5 difference on a 27 gallon tank. Plus not like i drive the truck all the time. Tank usually lasts me 2 weeks.