My 1.8L 92 Eclipse has 200K miles now. Just finished 2 doses of Auto-Rx 2K miles ago. Also used Seafoam for cleaning combustion chamber 500 miles ago. Bought this from eBay. The fuel master from the auction was just the bonus I thought I'll try. I was mainly buying the magnetic wrap. Anybody has any idea if this fuel master is any good? My car gets 29-30 MPG highway before ARX and all of the above. After ARX I got around 34 MPG. Now, it gets 35.52 MPG highway in 100 degree summer noon. The manufacturer's rate is 34 MPG. How is that possible? Especially on 87 Octane? Can cars "exceed" whatever MPG manufacturers stated? Just wondering. Not that I'm complaining. Car History So far, all the oils I've used are Maxlife HM, Regular Mobil Drive Clean, cheap SuperTech, Pennzoil, whatever is on sale and cheap. Whatever the oil is I always do 2.5-3K OCI (with filter) myself. Never over 3.5K. Also oil is never let low. Gas is always 87 Octane at any gas station and my engine never pings nor knock with 87.