I own a 1995 Buick Roadmaster Wagon. It has approx. 137,000 miles. It has an LT-1 Corvette engine in it. It has always performed great on gas mileage. Usually 28 mpg on the highway and nothing under 23 mpg in town. I drove it on a 400 mile trip and got 28 mpg. Came home. My husband changed the air filter because we changed the oil and had not changed the air filter recently. I filled up and drove and gas mileage dropped to 10-15 mpg. I drove the tank out and filled up again, same thing. We checked tire pressure. Filled it up a 3rd time and still 15 mpg. It runs smooth. Starts fine. I have not changed gas. I go to the same gas station that has the best gas and all my cars run terrific on this gas. It is not ethanol. It is 93 octane. I have not checked the fuel pump yet, but could it just have an immediate effect like that. The only think different was the air
filter. Any ideas?
Sunday, November 5th, 2006 AT 11:05 AM