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Old 09-26-2011, 04:58 PM
NNY528i NNY528i is offline
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Location: Amsterdam, NY
 
Join Date: Mar 2006
Posts: 345
Mein Auto: 1997 528i
Quote:
Originally Posted by cn90 View Post
Maybe it is my imagination but I have switched to standard gasoline (No Ethanol) for the last few weeks, even with Octane 87 (or 91), the fuel mileage "seems" to improve.

I have not done any actual measurement yet (such as driving 200 miles on highway and measure how much gas used), but it seems the gas mileage is better with standard gasoline.
For one who knows everything you should know this, Ethanol has a lower energy density than gasoline so if you run an ethanol blend then you will get a lower power output than you will out of a straight gasoline blend. The difference is about 1/3 less mileage gallon per gallon so at a 10% blend you will lose around 3.5% of your mileage. Welcome to the great ethanol conspiracy.
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>'97 528i, 202500 miles, Hella Xenons, 17" Stilauto wheels, Vogtland Drop Springs, Dynomax Race Muffler, Homelink, 540 brake upgrade, 15mm spacers Coming soon 5speed conversion
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