Robert Lang writes:
I really don't know. But I'm also pretty sure that avgas isn't supposed to
be dispensed for use in land vehicles. I've never approached and airport
on the matter mostly because I can go down to the end of the street (so to
speak) to buy the Sunoco race fuel.
But there is leaded and unleaded avgas. I'm running leaded while I can and
will switch to unleaded when there are not more leaded fuel dispensers in
the area. FWIW, the availability of these leaded fuels is largely based on
sanctioning bodies. NASCAR switched to unleaded a couple of years ago and
that has effected availability in some areas. But I think NHRA / IHRA
don't regulate so leaded fuels are still legal there.
Last item, I'm "pretty sure" that the leaded 110 is actually less
expensive than the unleaded 100. I think that is because there is
somewhat less refining necessary to make leaded high-octane.
---
For what it's worth, 100 octane avgas is not unleaded. The name "100
low lead" is a misnomer -- and its been called that well before there
was such a thing as unleaded gas. It is low lead in comparison to the
higher leaded 100/130 octane fuel it replaced. It has about 2 grams of
lead per gallon.
Technically it is "wrong" to run it in a on-road vehicle as the tax on
avgas goes into aviation infrastructure and the tax on autogas goes to
roads/bridges.
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