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100 Low Lead AvGas around Raleigh varies from $6.06 SS to $8.84 FS at RDU. Road taxes of around $.86.4/gal need to be added. Only 4 states have higher fuel taxes.I try to approximate a mix of one third AvGas, and two thirds standard unleaded, which is sufficient lead to protect the valves and valve seats and that mixture gives higher octane than simple unleaded. AvGas has always been more expensive than unleaded, but not as high here as it is there, or at least it wasn't last summer. I do not run my convertibles in the winter. When I am out of town, I go to the jugs of "Real Lead" additive I buy at the classic car shows. I think one can still find the LRP available in the UK, which is nice, as the Lead Replacement Petrol has additives that have the same function as lead.
As to pollution, a properly tuned classic engine emits less pollution than a car with a catalytic converter that is malfunctioning. The latter do not usually get replaced as they do not effect the functioning of the engine and do not get flagged in annual inspections. At least in this state, the inspectors only look to see that the converter is present, not whether it works or not.
Are you saying they don't actually put a probe up the tailpipe to measure nitrous oxides and unburned hydrocarbons?
Lead substitute is available on Amazon for about $35/qt or $90 a gallon.
I still maintain that supporting a 'classic', polluting, inherently unsafe (no airbags, primative suspension/brakes, etc) vehicle is a VERY expensive fool's errand, and use of such should be limited to sunny Sunday afternoons and the occasional parade, NOT as daily transportation.
But it's YOUR money and life including your passengers. Spend it as you wish.
Jim