Like many motorists, Albert Menaster has watched with alarm as gasoline prices zoomed past $3 a gallon. But when he drives his 1998 Ford Windstar into Silverlake 76, Menaster stops at the lone full-serve nozzle, where customers can bark a command heard mostly in old movies: Fill 'er up! ADVERTISEMENT In a world gone self-serve, Menaster belongs to a pool of full-serve holdouts who pay as much as 50 cents more per gallon than their self-serve brethren. If he pumped his own gas, Menaster could save $4.50 with each fill-up. But he and others say not even the unrelenting rise...