I'd like to thank larry quigly for the gas advice and silveysales also. You guys helped me so much. Now I have another question for you guys if you can help. I just had the dealership do a tune up. I.E., spark plugs and coils. Now prior to the tune up, the car had NGK spark plugs and coils before it burnt out. I noticed good if not great gas mileage when those were in. Now the dealership changed the spark plugs and coils. They installed bosch platinums. Don't konw if they're the regular platinums or platinum plus. Should I continue to leave it with bosch platinums? or should I switch out the bosch for NGKs? please advise. I love my Lincoln LS and want to get the best gas mileage out of this V8 monster.