Yep- - - -P.T. Barnum is in the gas additive business these days! If you want to add a little Diesel fuel to the gas for valve guide lubrication and about a 5-point octane boost, 1 gallon of Diesel to 19 gallons of gas is the ratio we used to use on the round track cars. Most "octane boosters" are just very lightweight oil that increases the specific gravity of the fuel and slows down the burn rate a bit. "Lead substitutes" do nothing but suck money out of your pocket.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!