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07-22-2012, 04:29 AM
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Join Date: Sep 2008
Location: Ireland
Posts: 4
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Avgas vs Mogas
We are in the process of final construction of an RV7A with a 200hp fuel injected Lycoming engine (A1B6D). With the increasing price of fuel it is becoming increasingly important to try and limit fuel price within the constraints of safety. I am looking at using a 50:50 mix of AVGAS:MOGAS to run this aircraft to limit running costs. What are your views/reservations/comments on this.
Thanks
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07-22-2012, 05:23 AM
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Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,122
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i think you hit the nail on the head. your engine and wallet will love it. you might even start using a stronger mix of mogas in the cruise tank as you feel better with time. 8 year satisfied user! on my second engine. first went 3,150 hours.
__________________
TURBO YES =VAF= Payed Jan2019
Ed D'Arcy
RV6-A 5,200+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015 
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
addicted pickle ball player
https://i.postimg.cc/tn3h4svg/IMG-3101.jpg
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07-22-2012, 05:45 AM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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Quote:
Originally Posted by turbo
i think you hit the nail on the head. your engine and wallet will love it. you might even start using a stronger mix of mogas in the cruise tank as you feel better with time. 8 year satisfied user! on my second engine. first went 3,150 hours.
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Ed, are you able to get ethanol free gas, or is that something you worry about? Also, how do you tanker the fuel?
To the original poster - my concerns would be the increased possibility of vapor lock, which your installation may or may not have problems with, and the potential effects of ethanol on proseal and other non-metal items in the fuel system, if you can't get ethanol free fuel.
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
Last edited by Kyle Boatright : 07-22-2012 at 05:47 AM.
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07-22-2012, 05:47 AM
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Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,122
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i use regular car gas in the mix. switch over to the strong mix about 10 miles out to purge the ethanol out. 5 gal cans using one of those high tech siphoning hoses with a one way valve.
__________________
TURBO YES =VAF= Payed Jan2019
Ed D'Arcy
RV6-A 5,200+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015 
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
addicted pickle ball player
https://i.postimg.cc/tn3h4svg/IMG-3101.jpg
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07-22-2012, 07:33 AM
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Join Date: Apr 2007
Location: Memphis
Posts: 159
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Find Ethanlo-free Mogas
Fortunately this site found me enthanol-free mogas three miles from my hangar.
http://pure-gas.org/
Barney, in Memphis
RV-3 & 4 flying
VAF paid up for 2012
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07-22-2012, 08:33 AM
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Join Date: Jul 2007
Location: TX & CO
Posts: 465
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I run 93 octane ethanol free mogas in my right tank that I use for cruise occasionally mixing in a bit of 100LL in that tank, and use 100LL for take off and landings, which I suppose will help me with vapor lock in these hot TX days. I fly it fairly regularly. If I were to let it sit for awhile, I'd consider filling both tanks with 100LL.
Many said I’m doing my engine a favor, as well as my wallet. One guy that runs 100% mogas looks at it this way. He’s saving at least a buck a gallon, and with a 9-10 gallon per hour flow, with a 2,400 TBO, he’s saved enough to pay for a complete new engine or an excellent overhaul back to remanufactured specs that didn’t cost him a thing, other than to switch over to mogas.
You’ll want to note at least here in the states that some gas stations that claim ethanol free actually aren’t, so you’ll want to test it with your simple glass tube you can get at aircraft spruce or other suppliers.
One pleasant surprise I found was that quite a few gas stations I’ve tested that supposedly have ethanol in it, DO NOT! I think after the government quit subsidizing them, there are going to be more gas stations that are doing away with ethanol, but still haven't removed their ethanol stickers from their pumps. Even my local Sam’s here doesn’t use ethanol, but there octane rating for high grade isn’t that good. I have to shop around for 93.
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07-22-2012, 08:46 AM
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Join Date: Jul 2012
Location: San Antonio, TX
Posts: 120
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Ethanol free
I believe the MOGAS in Ireland (Eire?), is ethanol free I think the fuel there is just lead free(on mainland UK its that way, fuel is horrendously expensive over there), I don't believe they put any fancy additives in it. But you'd need to confirm what if any additives they might use and how it will effect your engine.
There is a huge difference here between MOGAS and AVGAS prices, but finding ethanol free MOGAS here is still something I will consider when the time comes.
__________________
Roger
A Brit in Texas
RV8 N886LH (Reserved) BuNo 83320
Collecting books/info/tools.
Tail kit arrived! 9/30/2012
Construction started
"The engine's overheating, and so am I! Either we stand down, or blow up! Now which do you want?" Sqn Ldr Canfield.
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07-22-2012, 09:05 AM
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Join Date: Jul 2008
Location: NorCal
Posts: 565
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15-20 years ago, the flying club I was in used 90% mogas+10% avgas in their fleet of aircraft: J3 Cub, Aeronca Champ, Cessnas including 182s, and a Bonanza. No problems with vapor lock with the 10% avgas. This was long before ethanol of course.
__________________
Ralph Finch
RV-9A QB-SA
Davis, CA
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07-22-2012, 09:07 AM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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For those considering MOGAS and looking for sources - if you live near the water or in a region with lots of recreational fishing, look for stations to cater to boaters. Often, you will find "boat gas" is zero-ethanol. It will likely be a higher priced that auto fuel with ethanol but significantly lower than AVGAS.
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07-22-2012, 09:12 AM
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Join Date: Apr 2007
Location: Memphis
Posts: 159
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DATE: April 16, 2012 Lycomng Service Instruction No. 1070R
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