and it something you can buy at a hardware store - the secret is paint
if you can find some paint before 1970 there is lead used to protected it from the elements
since 1970 lead paint has been banned now they use titanium oxide
the lead stabilizes the fuel giving a higher octane level means a longer burn
you just need about a teaspoon of old paint for ever 5 gal of gas
i have a bunch of old lead paint in the storage shed - suckers who thought i was crazy keeping old paint see me laughing to the bank right now when my monthly gas bill is around 10 dollars dispute the 3.50 for premium