Better gas mileage on Cadillac?
Asked by JERRYMCGOVERN Jul 24, 2007 at 09:57 PM about the 1990 Cadillac Fleetwood Sedan FWD
Question type: General
I have obtained 28 mpg in the past with my car.
I used Castrol synthetic oil
I put 40 pounds of air in the tires.
I filled my tank on cold days.
I drove 60-65 miles per hour.
No hot rodding or fast starts.
Can I get better mpg now???
JERRY MCGOVERN
2 Answers
littlehorn answered 16 years ago
That's pretty good for a 1990 Cadillac. I'm assuming your vehicle has the 4.5L V-8 in it. Possible ways to increase gas mileage are to switch to a K&N air filter (higher air flow to engine), replace the oxygen sensor in the exhaust manifold (more efficient fuel-air mixture determined by the PCM), replace spark plugs and wires, and check onboard computer for codes such as throttle position sensor malfunction or mass air flow issues.
JERRYMCGOVERN answered 16 years ago
Will Amsoil work better? http://www.thebestoil.com/default.asp http://bestsyntheticoil.com/amsoil/index-amzoil.shtml