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Burned 89 Octane pump gas in my C-172 for hundreds and hundreds of hours. Not only did the engine run so much better, but we saved $$$ on the gas! We are not concerned about Ethanol, as our fuel line and tank sealant is chemical/alcohol tolerant. |
100LL in East Texas is just $3.60 and the airport is just 15 minutes away while 91 Non-Ethanol is $3.48 and is 45 minutes away, so not worth the hassle. I do have for my convenience a 55 gallon barrel at home so I can fill up at the airport then empty at my house so I?m not flying around heavy with full tanks. https://www.facebook.com/49032794805...695494&sfns=mo
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We can only dream of fuel being that cheap!
Avgas can be around $12 gallon in the more remote places outback! I run a 25% 98 'shandy' in the cooler months, engines runs just fine:) |
It's not just a cost issue, but the big factor for us is the engine was designed to burn 93UL fuel.
Much cleaner, longer life oil and plugs too. |
Just found 93UL Ethanol free gasoline, about 3/4 mile from my house! The price? $7.00/gallon.
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Only for LOW compression engines and need to have excellent cooling to avoid vapor lock. STC for Motor-Gas still results in vapor lock issue. When I say vapor lock I mean engine stops running. RV cowls are compact and hot. Ethanol and Alcohol can cause swelling of seals in fuel system and loss of power. |
Well...trying to remember the last time we had vapor lock with a fuel injected engine...never is the answer.
We run Reformulated Gasoline here year round. The RVP is maxed at 7.8. For 100LL, the max allowed is 7.0, although the numbers I see more often are in the 5.0 to 6.0 range. My engine was designed for lead free gas. It will burn cleaner, so longer life oil and plugs is just a fringe benefit. If there is oil streaking down my fuselage, it will be due to an oil leak. If there is an exhaust smudge on the cowling, the mixture is overly rich. My C-172 ran for 100's and 100's of hours, all the way up to the low teens on 89 Octane pump (auto) gas. Vapor lock? Never. I guess I have just been lucky? Maybe all those who burn mogas in their RV's are just lucky too? I honestly don't know. edit: I do have a friend who likes burning the dreaded-leaded, simply because that is the only way he gets that "50 Mission" exhaust stain, just like a real P-51. |
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Those who say something is impossible should not mess with those that are doing it. |
High Wing
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Skylor |
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Question for you engine tuners...as we plan to burn both 93U E10 and 100LL, with the ECU being programmed only for 93U, what will the default program do when burning 100LL? Will it burn richer than the Mogas?
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Just a data point
Just a data point here. I was in Davis, CA two days ago.
At the airport (EDU) the price of 100LL was $4.07 ($4.02 if pre-paid), and the price for 87 at the pump was $3.87. I was suprised at only a 20 cent spread between the two. ![]() |
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