I've had my 2003 Nissan Frontier Crew Cab supercharger for 2.5 years. Got it with 17,500 miles on it and have it up to 41,500 now. I love this truck..... but I need better gas mileage. I am averaging high teens, low 20s on the highway and I just love this truck. I take really good care of it. Give it the proper maintenance it needs, but haven't done the 30,000 mile tune it on it. Do I really need it? Anyways, if you have suggestions to improve gas mileage, then feel free to share. Thanks.