The obvious reason would be a cost savings but only if you need 100LL.  If
your engine spec says 80/87, there's no gain.  I wasn't aware that ethanol
free mogas had become so impossible to get.

Danny Miller
N 38° 43' 27"
W 77° 30' 38"


-----Original Message-----
From: Lorn H Olsen [mailto:lorn@dynacomm.us]
Sent: Friday, September 24, 2010 10:02 AM
To: Lancair List
Cc: Danny Miller
Subject: Re: Avgas & Mogas mix

Danny,

Why mix the fuel? The engine manual for my engine, the O-320-D1F, 160 HP
specifies 80/87 octane fuel. What is to be gained by mixing?

The real problem is getting auto fuel without ethanol. Moisture will combine
with the ethanol effectively sucking it out of the fuel and laying it at the
bottom of the tank. Without the ethanol, the octane is lowered. Ethanol may
or may not also eat the coating off of the gas tanks. I have seen this
happen.

3 years ago, many auto gas stations in Michigan sold fuel without ethanol
but not any more. Last year I tested the fuel at 12 gas stations. All had
changed to a methanol mixture. The only 3 airports that I have been able to
find that still sell non-ethanol auto fuel are in Marshall, Mi, Chesapeake,
Va and Barnwell, SC.

Lorn

> From: "Danny Miller" <danny.miller@verizon.net>
> Date: September 23, 2010 5:24:26 PM EDT
>
> I heard through the grapevine that a mix of 2/3 mogas with 1/3 avgas is a
viable mix for most LNC2 types. Does anybody have experience with this?
>
> Danny Miller
> N 38° 43' 27"
> W 77° 30' 38"

--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,750 hrs, N31161, Y47, SE Michigan