Jim wrote:

European countries tend to tax consumption higher, the US doesn't. One reason
avgas is kept expensive is because autogas is very expensive to encourage
public transit and excellent high speed rail service. If avgas would be priced
lower then autogas, there would be an incentive to burn avgas on the road
(which wouldn't do cat converter much good.)

How prevalent is the use of a cat in Europe these days? Ten years ago, nearly
all the gas was still leaded and catalytic converters were nearly unknown. I'm
aware that they've gone to mainly unleaded fuel, but do most European cars now
have the converters as well?

George Patterson
There's plenty of room for all of God's creatures. Right next to the
mashed potatoes.