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Old 02-19-2012, 07:20 AM
Location: Longmont, CO
48 posts, read 216,848 times
Reputation: 73


Originally Posted by GnomadAK View Post
Oh, and the FAA forbids the use of gasahol in light aircraft. Says so right on the pump.
Do you know why this is so?

It's because ethanol is hydrophilic. That is, it attracts water.

On the ground, that's not a huge problem. Mostly, it can be avoided by keeping fuel fresh and tanks full. The minute amount of water that does make it into the engine can be dealt with. Obviously, since water is not compressible or combustible, large amounts of water can be a problem, but outside of storage issues, it rarely is a practical problem. In a rare instance where there's enough water to stop the engine, you're stuck by the side of the road.

In the air though, things get different. The average temperature at 10,000' is about 20F. (7(b) The Layered Atmosphere)

Of course, water freezes at 32F. Add to that the often extended storage cycles of aircraft and you've got a recipe for ice in the fuel lines. Now, as I said, if your car's engine conks out, you're going to have to wait for the tow truck. If your plane's engine conks out, you're going to crash (and, probably, die). It makes sense then for the FAA to error on the side of caution, doesn't it?
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Old 02-19-2012, 01:54 PM
Location: Va. Beach
6,384 posts, read 4,227,160 times
Reputation: 2273
Originally Posted by Deez Nuttz View Post
I own a turbocharged Buick Regal (little brother to the Grand National) and it requires the premium octane fuel.

Around here we have mostly 91 octane but I did manage to find one station that carries 92 octane. The attendant tells me it's pure 92 octane with no ethanol added.

Not sure if that is good or bad, can anyone confirm?

Gas with Ethanol has less energy during combustion than gas without. However, gas with ethanol burns more slowly than gas without, making the octane higher.

BTW, mine is a supercharged grand prix gtp/comp g, and I normally use premium, however now and then a good fillup at sunoco with the GOOD stuff, 100 octane makes my little machine very happy.
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Old 06-15-2012, 12:18 AM
1 posts, read 1,419 times
Reputation: 10
I'm running premium non alcohol fuel in my pickup (1990 f-150) and find that when I pull hills with it, my vacuum gauge reads higher for the same speed than it did with 89 octane gasohol, which means I am not opening the throttle as much.
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