i recently picked up a 92 gmc sierra. it has a 3" body lift and 33s. i drive it every day an im getting about 10 mpg . truck has 267k miles has a new tranny with shift kit and a new jasper rear end. im looking for some cheap fuel milage. im gonna try and do a tune up pretty soon and change the oil and fuel filter but other than that what else can i do? i need some help as this thing is killing me! thanks!