Some hi octane is obtained using MTBE/ethanol - Saab 9-5 Bulletin Board - Saabnet.com
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Some hi octane is obtained using MTBE/ethanol
Posted by Greg W [Email] (more from Greg W) on Tue, 30 Dec 2003 07:44:05
In Reply to: mpg affected by octane?, SaabCPA, Tue, 30 Dec 2003 05:11:05
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Under steady-state driving conditions, its not the octane per se that gives higher/lower mileage, but rather the recipe for the gasoline itself. If MTBE or ethanol is blended into the base gasoline by the gasoline manufacturer to achieve higher octane, there is less BTUs available, hence lower mileage.
However, as others have said, there are a variety of variables which influence mileage. In fact, gasoline blends can vary in energy (read: BTU) content up to 8% (this from a California pre-reformulated gas study). With lower gasoline volatility in the summer, more of the dense hydrocarbons (called "aromatics") are used, resulting in about a 1-2% higher energy content then winter gasoline.
I guess we'll all have to go on more road trips to get enough data points to give us a better SWAG at the affects...
posted by 146.27.12...
Posts in this Thread:
- mpg affected by octane?, SaabCPA, Tue, 30 Dec 2003 05:11:05
- Could it be lower ambient temp?, Al S, Tue, 30 Dec 2003 11:24:52
- Which engine?, Rick D., Tue, 30 Dec 2003 09:18:31
- Re: mpg affected by octane?, Dean, Tue, 30 Dec 2003 08:05:10
- Some hi octane is obtained using MTBE/ethanol, Greg W, Tue, 30 Dec 2003 07:44:05 <-- Viewing This Message
- How was the ACC set?, keeton, Tue, 30 Dec 2003 07:20:38
- Lower octane = more avail fuel., EricG, Tue, 30 Dec 2003 06:38:29
- less performance means less fuel needed (n/m), Nsteph, Tue, 30 Dec 2003 05:31:40
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