You have the reed vapor pressures backward, fall, winter and spring it is 9# here for pump gas. Summer here it is 7# to help keep gas fumes out of the atmosphere. Avgas generally has even less so it is even less prone to vapor lock..less.

I own a fuel company and have been selling Sunoco race fuels since the mid 80s and still do today, yes even today I sold some. I have met Sunoco's Mike T Miller and learned a lot from him over the years. He's the technical operation manager for Sunoco performance products.

Av gas check it out. [/quote]

Yeah.. summer fuel is low RVP winter in this area is
right at 10#... I tested the RVP on every load of fuel
I ordered.. and I even had a load with 15# RVP which
was a special order... plus I had to test it before every
test... its measured from 32*or less up to 100*..you use a
stainless seal vessel(we called them bombs) and its set in
the 100* water and that water temp is exact