# Santa Came Early Today! **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [November 21, 2007, 11:00am UTC](https://forums.speedlife.net/t/santa-came-early-today/193768 "2007-11-21T11:00:17Z")\ **Posts on this page:** 1\ **Showing post:** 30
**Author:** ![Hycomp](https://avatars.discourse-cdn.com/v4/letter/h/d6d6ee/32.png) [@Hycomp](https://forums.speedlife.net/u/Hycomp)\ **Post date:** [November 27, 2007, 6:10am UTC](https://forums.speedlife.net/t/santa-came-early-today/193768/30 "2007-11-27T06:10:33Z")
> [@mac people enter](https://forums.speedlife.net/t/mac-people-enter/33562/24): > > maybe. 40 percent seems a little steep. most dudes on dsmlink forums go off of the 20-30 and it seems to work out. my buddy and i have fic 1000’s and similar setups and the same maf sensor and his global scale is -35 fuel taken out on e85 and im at -55 percent taken out on 93 for example so thats like 20 percent difference, but all cars are different though I swear theres no way to know exactly till you try. If your buddy on E85 is running a map cut back 35% and you are running a map cut back 55%, he is running approximately 44% more fuel than you if you both are cutting back from the same starting point. He’s running 100%-35% = 65% of starting point amount of fuel You’re running 100%-55% = 45% of starting point amount of fuel 65-45 = 20 difference in values 20/45 = .44 = 44% difference in final values = 44% more fuel. --- _[View the full topic](https://forums.speedlife.net/t/santa-came-early-today/193768)._