I've been looking at ways to increase gas mileage on my 2003 Silverado
1500 with 4.8L V8. It already gets 20-21MPG in the summer, and 17-18 in the winter, so I really don't have much to complain about for a full-size truck. It would be cool if I could get 1-2 more. 5-10% more out of a gallon of fuel is 15-30 cents right now. 20 gallons a week would mean $3-$6 a week, or $156-$362 a year. That's if prices don't go up.Cold air intake kits are advertised to increase horsepower and improve gas mileage.
A cold air intake kit for my truck runs between $250 and $280, depending on which one I get. If I could get an extra 1 to 1-1/2 MPG, it would pay for itself at current gas prices in a year or so.
What are people's thoughts on these? Do they live up to the promises? I know when they do the cold air kits on those hotrod how-to shows, then do dyno runs, they get a few extra horsepower, but they don't mention gas mileage.