Patent ID: 7226489

Claim:
An unleaded gasoline for reducing at least one of combustion chamber deposits and intake valve deposits, comprising: a major amount of an unleaded gasoline base fuel; and an effective amount to reduce at least one of combustion chamber deposits and intake valve deposits of at least one of a first additive of the formula wherein n is an integer from 10 to 40 inclusive; e, f, and g independently are an integer from 0 to 50 inclusive, wherein at least one of e, f, and g is not 0; R 5 and R 5′ are independently selected from the group consisting of H, CH 3 , and CH 2 CH 3 ; R 6 is H or C 1 –C 20 alkyl; and wherein R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of H, and C 1 –C 100 alkyl, or taken together with the two carbons between R 1 and R 2 , or R 3 and R 4 form an aliphatic ring of 5–8 carbon atoms; and mixtures thereof, and of at least one second additive of the formula selected from the group consisting of and mixtures thereof, wherein y is an integer from 1 to 50 inclusive.