I had a 03 hemi reg cab and i never did the hand calc on it but I knew it was never seeing over 14+, even with higher grade octane, but then again, its a 6K pound truck so I wasnt to worried about that honestly.

 

well I might give it a shot and see. I mean one tank wont break the bank to try. Now If I do it every day then yes it will hurt the bank.

 

But if you get better mileage than it might be worth the price of getting a higher octane fuel

 

There might be, but from what I hear asking some people at work and my mechanic buddy, he said that most likely I wont see any gains since these are not high compression engines. He said try it once just to see but dont be surprised if nothing happens to the mileage.

 

Which what some people dont realize is yes its more expensive for 89 but here its only 10 cents more for 89 so on a full tank of gas your only spending like 2.00 more than what you normally would with 87.

 

I think the difference some of you people are seeing is because the 87 gas has ethanol added and the 89 does not. Where I live, all gas has ethanol added nowadays and I see no difference at all.

 

I second that eagle. I tried E85 in my wife's minivan when we lived in Minnesota. Her mileage went from 20 average to 15. I now live in Kansas and they don't put ethanol in all the gas. her mileage now averages 22 per gal.

 

E85 has way more ethanol in it than reg gas. They say up to 85% ethanol is in E85 where in most reg gas its just 10%. Thats why you can get it for like a 1.90 but you burn it way faster than reg so the price difference isnt any better.

 

Here 89 is $.25 a gallon more expensive. Still only like $5 on a fill up but when you're already paying the highest prices in the country $5 is a lot more.

 

when i filled 89 in, it was 10 cents more than 87. 93 was 15 cents more than 89 (25 more than 87)