AVGAS vs MOGAS

[Bartman1959 12]

Is there any issue mixing AVGAS and MOGAS?  If you're flying cross country on MOGAS, and your fuel stop only has AVGAS, will you have any issues mixing the two?  Will your GPH, your cruise speed, engine temps, or anything else change?  I know the $$$ in your wallet will change, but I'm concerned about aircraft performance.

[C5Engineer 1170]

I've done it many times with no ill effects. Rotax's hate Avgas. Fuel is fuel....it'll burn it regardless. Your octane rating is unknown at that point but it'll be above the min and that's all that matters.

[Bartman1959 12]

That's what I was thinking, but I wanted to hear from those who do it all the time.  Thanks.

[Av8r3400 1178]

I have a hangar neighbor who runs mix all the time in his Champ.  25-75% av to auto.  Runs great and lots less lead to cake things up in the C85.

[marcusofcotton 51]

Run it harder with avgas to reduce lead deposit formations.

[chopndrag 226]

I run a mix of avgas and mogas . Never had a problem

[Bartman1959 12]

Thanks for all the input guys, I appreciate it.

[Ronin 34]

I used to run nothing but 100LL in a 914 Europa. Used TCP and always ran it hard (5,300/5,500) in cruise. It never had lead fouling but the side of the plane would turn gray past the exhaust.

[Bartman1959 12]

The reason for my question is that I'm looking at a KF 5 with a Subaru engine, and not all airports have MOGAS.  So, I just wanted to make sure switching between MOGAS and AVGAS, and mixing the two cause no problems with the engine.  You guys are awesome.  Thanks.

[skypics 89]

When I fly from SoCal to Idaho each year I mix 10 gallons of mogas 91 octane with 18 gallons of avgas.

There is no problem with the mix, but you can't leave mogas with ethanol in the tank for long duration because the ethanol softens the fiberglass resin of the glass tanks in the Avid Flyer Aircraft.

The mogas/avgas mix is usually used up on the first half of the 1000 mile trip.

Mogas with ethanol gives less range than avgas.

John M

[Bartman1959 12]

Thanks for the info John.  Our trips will opposite to yours, Idaho to Bakersfield a few times a year.

[skypics 89]

Bartman

We fly to Idaho for the beautiful scenery and to be around pilots who like to fly to remote strips.

We fly over Bakersfield on our way and I wonder what the attraction to Bakersfield would be for someone who lives in Gods Country?

John M

[Bartman1959 12]

Bartman

We fly to Idaho for the beautiful scenery and to be around pilots who like to fly to remote strips.

We fly over Bakersfield on our way and I wonder what the attraction to Bakersfield would be for someone who lives in Gods Country?

John M

John,

That's simple, so we can see our grandkids.  I have a son who lives on the Central Coast, so we stop over there as well.  Flying will just make it easier to visit more often.

[skypics 89]

Only Grandkids would force me to fly to Bakersfield area when living in Idaho. So I understand.

John M

[Bartman1959 12]

Only Grandkids would force me to fly to Bakersfield area when living in Idaho. So I understand.

John M

Believe me, I feel the exact same way.