So far, I've been averaging 17 mpg but did get 20mpg once. Since my fuel gauge is broken, I calculate it everytime I fill up and reset my trip. I have the stock 225 tires. The 20 mpg was with more then average highway travel (at 60ish mph in 5th) and I rarely opened the secondaries on that tank. Disconnect your secondary diaphragm and watch the mileage climb! <img src="/forums/images/graemlins/lol.gif" alt="" /> Of course it'll be a real slow climb. <img src="/forums/images/graemlins/nana.gif" alt="" />

-Todd
1987 Montero 2.6l 5-speed (Sold...but I still miss her)
2008 Jeep Patriot Sport 4x4