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Space Ghost

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Uh yeah, don't think that is what he was talking about. More than likely he was referring to the nearly 2 inches more diameter which will reduce gas mileage and increase the ODO reading faster than the smaller radius 35 inchers even though they are roughly 35.5 inches or so. Put some 40s on there and see where you mileage goes
Also, even theyre close or same in weight, if the weight is farther from the hub/center which will happen on a larger dia. tire, itll be more felt in terms of power and mileage. Of course the extent of it is another thing.
 

RogueClimber

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I think AV gas is still leaded fuel.

From the FAA:

Although there are various ASTM Standards for avgas, almost all avgas on the U.S. market today is low lead, 100 MON avgas (100LL). This grade of avgas satisfies the requirements of all piston engines using avgas, regardless of their performance level. Jet aircraft and turbine-powered, propeller aircraft do not use avgas, but instead use fuels very similar to kerosene, which does not contain a lead additive.
 

New recaros

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  • In the United States, the Environmental Protection Agency started an effort to phase out leaded gasoline in 1973. Starting in the 1970s, new vehicles were designed to run on unleaded gasoline. In fact, the new cleaner generation of cars couldn't run on leaded gasoline — it would destroy their catalytic converters.
 
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