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Alcohol and gas mix
This is an interesting thread with lots of good information. It was stated above that ethanol will decrease octane rating in fuels. This is different than what I have always thought since around here, the "mid grade" 89 octane is often an E10 blend that is actually a few cents cheaper than non-blended 87 octane. I thought that this was because it was cheaper for the gas companies to raise the octane with ethanol than it was with petroleum based stuff. The cheap side of me always buys whichever is less $$ and I have never seen a milage or performance difference with either our Olds Intrigue (24V V6) or F-150 (302 V8). There are a few stations in the Wichita area that sell E85 (85% ethanol) but your vehicle needs to be rated to use it. It is a lot cheaper than gasoline right now. I talked to a relative who ran a tank through his new SUV and he reported no problems at all.
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Alcohol and gas mix
Brendon, the octane rating is a comparison of the performance in burn rate and knock (flash point) tests when compared to heptane value 0 and iso-octane value 100. The tests try and define the delay and speed of the burn.
The fuel value or BTUs per gallon is not represented in the octane rating. Methane, propane and butane all have less fuel value than gasoline in terms of BTU gallon. Pure ethanol has a greater vapor pressure and lower boiling point than iso-octane. Therefore in pure form we expect it to have a lower octane rating. We expect it to burn more like hexane. In formulation? Gasoline has thousands of different compounds in it and how it interacts will the ethanol? MTBE is added to the gasoline primarily for the oxygen content, but it also increases the Octane rating. The other factor is the water content in the ethanol. This will delay the burn and possibly increase the power available, (remember that you are using all the energy available in the gasoline only a fraction) if at the right concentrations. People are still trying to sell water injection to increase your power.
Can you have a good octane rating, lower fuel value and poorer milage? Yes.
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Alcohol and gas mix
Shortmagnum - I've got a 2000 Honda CBR600F4. Would rather have a VFR, but that was out of the price range at the time. I haven't had the bike running this year due to the baby. The bike is the last year they used carbs on that model. It has a bad tendancy to plug the jets and drop cylinders if it sits too long. I've gotten it running twice this year, but then due to baby needs, travel for work, etc, I don't finish putting it back together. So when I am ready, it's not running on all cylinders again. Sucks!!
But now that diesel jumped from $3.12/gal to $3.39/ gallon overnight, I think the F-250 is just going to have to make way for the bike. I don't have the time to spend to get it running to use until the snow flies, but at the diesel prices, I don't have much of a choice. I'll have to make time which means something else has to give.
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Alcohol and gas mix
Iowa, the CBR600 is a really quick bike (as I'm sure you know). I've been able to spend quite a few hours on my BIL's F4i and RR. It's the first (and only) time I've seen 150+ mph. Take care.
Dave
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Alcohol and gas mix
Shortmag - I know how fast the bike is. In 1996 I got a CBR600F3. Fun bike. But then in 1998 I moved to northern Minnesota. No hills. No curves. Roads just went straight and were flat. I dropped my garage door opener out of my pocket at 145 mph. I found the biggest chunk and it still worked. Then I sold the bike before I got killed or arrested. I knew what would happen.
I'm older now. And slightly more mature. At least I realize I am not invincible and I don't heal as fast as I used to. I also know there is a crap-load of suicidal animals that live near me. Me on bike vs deer = we both lose.
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10-19-2005, 05:53 
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