Make sure the tune up parts are good, clean your maf senser, & make sure the engine has a good t-stat in it. Cooler running efi engines use more gas. Have your injectors cleaned, I got a canister inj. cleaner set up, total investment under $150, most shops that I know charge around $100. When I first started doing my car & truck my neighbor asked what I was doing, I ended up doing his too, made some $$ back.
