Patent ID: 8715376

Claim:
A lead free fuel composition comprising: (a) a major amount of a mixture of hydrocarbons in the gasoline boiling range, and (b) a minor amount of an additive mixture comprising: (i) at least one compound having the following formula: wherein R 13 and R 12 are independently hydrogen, methyl, ethyl, propyl, or butyl group with the proviso that (a) when R 13 is hydrogen, R 12 is methyl, ethyl, propyl, or butyl group and (b) when R 12 is hydrogen, R 13 is methyl, ethyl, propyl, or butyl group; and (ii) at least one dicyclopentadiene; wherein components (b)(i) and (b)(ii) are present in the additive mixture in a ratio in the range of from about 1:19 to about 4:3.