Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - increasing compression, running on regular gas?

getnpsi · 03-04-2009, 04:02 PM

alumimum headed cars can usually run into the 9.0-9.8:1 area and still denote 87 octane in the manual. Iron head cars, like the stock 5.0 mustang i have. just look at it wrong and they are already knocking. Since you will have the head off i suggest getting some simple cleanup work done to eliminate "hot spots" where preignition can happen even with mid grade and premium fuel.

the 10% ethanol statement I do not agree with. They add their ethanol, and when tested chances are its still freakin 87 octane. You'll never get a free bonus from an oil company!

Again as stated in your post, driving style will still be the deciding factor. More power from a dead stop when driven correctly can help your city mpgs. Also more TQ will allow you to short shift the car more than before, as well as staying in a higher gear longer on an incline.

03-04-2009, 04:02 PM	#14 (permalink)
getnpsi EcoModding Apprentice Join Date: May 2008 Location: Fontana, CA Posts: 167 Red Egg - '95 Ford Aspire 90 day: 38.51 mpg (US) Dodge SRT-4 - '04 Dodge Neon SRT-4 2.4L Turbo 90 day: 26.24 mpg (US) Thanks: 1 Thanked 0 Times in 0 Posts	alumimum headed cars can usually run into the 9.0-9.8:1 area and still denote 87 octane in the manual. Iron head cars, like the stock 5.0 mustang i have. just look at it wrong and they are already knocking. Since you will have the head off i suggest getting some simple cleanup work done to eliminate "hot spots" where preignition can happen even with mid grade and premium fuel. the 10% ethanol statement I do not agree with. They add their ethanol, and when tested chances are its still freakin 87 octane. You'll never get a free bonus from an oil company! Again as stated in your post, driving style will still be the deciding factor. More power from a dead stop when driven correctly can help your city mpgs. Also more TQ will allow you to short shift the car more than before, as well as staying in a higher gear longer on an incline. __________________ Last edited by getnpsi; 03-04-2009 at 04:10 PM..