checking in late here so suggestions i offer have prolly already been made...i too was getting pretty crappy gas mileage...in the teen's consistently city and not alot better highway...
i changed plugs and wires to whats in my sig...cleaned the throttle body and the egr ports (which got rid of cel i had for 6mos)...added monster flow filter and regularly add REGANE by gumout to the fuel tank...all of these things make for a noticeable improvement in performance and a bit of improvement in mileage...im more concerned with performance so this is acceptable for me
i've gotten older and wiser (i hope) and so now i change my oil regularly and make sure to use only some of the better oils on the market...usually mobil 1 in the engine and the atx
those things have improved overall driveability and performance but the coup de gras was installing 'quality' tires on the front about a month ago...kum-n-ho's ecsta 711 205/50hr-15....the tires made the most appreciable difference in mileage
now my city mileage is better but still sucks cuz there's lots of wide open straights and other fun places to drive hard....on the freeway however my last 3 trips to see mom 100+ miles one way have yielded me ~31-37mpg and i dont baby my car
99 expedition eddie bauer, 5.4 v8, k&n drop-in, 3" magnaflow catback and gas mileage that makes the contour look like a hybrid
| 
