# e85 and carb **URL:** https://forums.speedlife.net/t/e85-and-carb/193333 **Category:** PittSpeed Automotive **Created:** [October 28, 2007, 1:47pm UTC](https://forums.speedlife.net/t/e85-and-carb/193333 "2007-10-28T13:47:30Z") **Posts on this page:** 1 **Showing post:** 14
### Author: ![69camaro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/69camaro/32/6046_2.png) [@69camaro](https://forums.speedlife.net/u/69camaro) #### Post date: [October 29, 2007, 11:15am UTC](https://forums.speedlife.net/t/e85-and-carb/193333/14 "2007-10-29T11:15:32Z")
> [@checking pushrods in LS1](https://forums.speedlife.net/t/checking-pushrods-in-ls1/33222/7): > > thats were i was kinda going with this… if race fuel is 5 to 6 dollars and e85 is 275 would it be economical to try a few gallons of 85 just to see what happens or just buy some race fuel. question 2 how much difference does race fuel make over regular 87 octane. do you need to run race fuel? if you car will run on 87, race or e85 fuel will do nothing for your motor. You may pick up a very few hp because you can advance your timing a little more but its not worth it. I am assuming you have a naturally asperated motor and unless your compression is around 12:1 there is no need for e85 or race gas. the only reason the flex fuel cars are around is because alcohol burns cleaner and is better for the air. e85 is 85% ethenol 15% gasoline --- _[View the full topic](https://forums.speedlife.net/t/e85-and-carb/193333)._