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tamarsha · 01-28-2011, 06:36 AM

When I had FVD build my ECU mapping I made sure to tell them all of my mods and that run 93 octane exclusively. I assume they tweeked it a little to take advantage of that.

There is one gas station near me that sell 100% gas. I try to go by there when I can. It is a little more expense but if you do the math…

Ethanol has about 75% the caloric value as gas… At most stations, 10% of the gas is Ethanol… that is 97.5% the “power” of 100% gas.

A 280 Hp Boxster S will see a 7 Hp gain running 100% gas over a 10% Ethanol mix. Is that worth an extra $0.10 a gallon or $1.50 a tank? Less than $0.40 / Hp gain. Show me a better deal out there.

01-28-2011, 06:36 AM	#8
tamarsha Registered User Join Date: Jul 2008 Location: Conway, SC Posts: 109	When I had FVD build my ECU mapping I made sure to tell them all of my mods and that run 93 octane exclusively. I assume they tweeked it a little to take advantage of that. There is one gas station near me that sell 100% gas. I try to go by there when I can. It is a little more expense but if you do the math… Ethanol has about 75% the caloric value as gas… At most stations, 10% of the gas is Ethanol… that is 97.5% the “power” of 100% gas. A 280 Hp Boxster S will see a 7 Hp gain running 100% gas over a 10% Ethanol mix. Is that worth an extra $0.10 a gallon or $1.50 a tank? Less than $0.40 / Hp gain. Show me a better deal out there. Last edited by tamarsha; 01-28-2011 at 10:56 AM.