I have a 2000 Blazer, 46,000 miles. She runs great, I get regular oil changes, other fluid changes, check tire pressure, check belts (just had the serpentine changed).
I'm looking for anything else to get better gas mileage. She's never had a "tune-up". Is this necessary? and what is it other than spark plugs and checking the timing? and will this help gas mileage?