Discussion Starter · #1 ·
My 2000 has about 75,000 on it. I replaced the plugs a few years ago. Mileage slowly went down to just under 12.00 in short run city driving. I put in a new set of NGK G+ and the last tank showed 14.2. Outstanding. Is that reasonable? I grew up changing plugs every 10k in my Ford flatheads and later the 289s. Unleaded made the big difference. I just do not believe 100,000 makes sense.