A fuel additive and method for improving fuel economy in an engine. The method includes providing a fuel composition to an engine, wherein the fuel composition includes gasoline and from about 10 to about 750 ppm by weight based on a total weight of the fuel composition of a fuel stable additive of the formula wherein R1 comprises a saturated hydrocarbyl group having from 6 to 30 carbon atoms, R2 is an alkyl, polyalkyl, alkoxyalkyl or polyalkoxyalkyl group containing from 2 to 25 carbon atoms, R3 is an alkyl group containing from 2 to 5 carbon atoms, R4 is a linear alkyl group containing 2 to 3 carbon atoms, and x is an integer selected from 0 and 1, and combusting the fuel composition in the engine.