"Robert M. Gary" wrote in message
om...
(JimT96309) wrote in message
...
I am currently interested in an older C-172 (Cont. 0-300 engine) that
has an
STC for auto gas. My questions a

1. Can I continue to use AVgas instead of auto fuel?

2. I often fly into/out of Big Bear City, Ca. (elev. 6500ft.) I've
been able
to get out lightly loaded (me and one in the right seat) at a density
altitude
of 8,100 with one of our clubs 172s with the 320H2AD engines at 160 hp.
What
difference would I see with the 15 fewer horses up front?

I'm not 100% sure about the Big Bear area, but in most parts of
California the FAA prohibits the use of autogas. Autogas in Ca usually
(depending on the county) contains MTBE which is prohibited by the FAA
because it eats fuel lines.

-Robert

The FAA does not prohibit using auto fuel. They prohibit using fuel with
alcohol. Airports can purchase autogas without the alcohol. MTBE is not a
problem. The problem is natural rubber parts which are damaged by alcohol,
not fuel lines. Might be time to review your STC.