Bad PMG's on Texaco 10% ethanol fuel! + rant! - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Bad PMG's on Texaco 10% ethanol fuel! + rant!
Posted by Dean (more from Dean) on Fri, 12 Apr 2002 22:08:26
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Prior week I was running on a tank of Texaco %10 ethanol, 91 octane. 91-92 octane is what you get in Kansas and higher altitudes for hi-octane fuel.
I was getting lots of commute runs at 25-26 mgs which really sucks. Ethanol is about 1/2 the combustion energy of gasoline, so the energy in the fuel would be off by about 5%. But my mpg's were more like 10% down.
Tonight with flat winds I got 30 mpg's on my commute, which is what it should be. I can get better with the snow tires, but the summer performace tires have a higher rolling resistance.
Yes, I know, the other fuels probably have some ethanol in them was well. But just the same, the impact of 10% ethanol was very pronounced.
Now the real rant:
This is what we pay for having politicians mandate 'oxygenated fuel' for all of us, when it will only make a difference for quite old vehicles that do not have O2 sensors and closed loop mixture control. These fuels make those vehicles run a bit leaner so their emissions are improved. But, all of the other vehicles have ECU's which simply map more fuel to get to the same emissions end point. This makes the vast majority of vehicles burn more fuel creating a huge expense and energy waste while increasing CO emissions. The vapor losses with these fuels also increases smog, and many informed leaders of large metro areas are figthing to get the alchohols out of fuel.
posted by 65.68.10...
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