Technologies pioneered by the 50-mpg Prius and the Volt, which burns no gasoline at all on most trips under 40 miles, will soon be found in all cars. Virtually every car will be a hybrid with many variations of electric assistance, increasing fuel economy in a variety of ways. Many upcoming vehicles using electrification won’t call themselves hybrids but will promise better fuel economy or performance without outlining specifics. Buick will offer the 2012 Buick LaCrosse and Buick Regal using an electric system called eAssist to achieve better highway and city driving miles per gallon.