Tuned it all up to factory specs yesterday and drove it about 50 miles yesterday and filled it up. Last fill up was in March, so I totaled the miles and I got 16.9mpg. A lot of that gas was used sitting in the driveway running while I tuned and troubeshooted it, so that was a little on the low side. Using the stock settings (and hopefully get the rest of the exhaust on and replace the plug wires and coil), I'm going to drive this tank down with some mixed mainly city driving and see what the mileage is then. Then maybe do a highway run to get the max mpg out of it. Although the speed limit is 70mph here now, which is probably not peak for fuel efficiency for the 2.73:1 axle in third gear.