1996 GMC Sonoma up to 30 MPG where it’s supposed to be? – cruises for 30 somethings. What do I need to do to get 18 MPG with my 4-cylinder 1996 GMc Sonoma? “There must be something wrong with her, although to be punished. There is nothing wrong with my driving, not the gas gun, I had the cruise control on highway 55-60 MPH, the extra weight in the back, I drive slow in comparison to almost everyone, and, last but not least, IT’S a 4- cylinderinder with only 120 hp! “I was driving a 1989 Pontiac Grand Prix LE with a V6 with 180K miles””]
Source: http://bumpslinitalia.blogspot.com/2010/02/cruises-for-30-somethings-what-do-i.html