I think I might have been capable of making a 40mpg tank recently. Everything in the car was in working order (including the O2 sensor) and I was driving ~150 miles. Problem was I had no sleep for the first 75 miles so I was...not driving slow on I75/I4. This is only a VERY crude estimate but on the way back I must have been getting around 40mpgs because I believe I made out with about 35mpg INCLUDING my retarded sprint upstate. It's been a month or so since I made this trip so I don't remember any numbers but I am going to be back with a vengeance and some ridiculously good numbers sometime when I have had some sleep and need to make a long trip. Still stuck making I think only 26 or so mpgs in town but I'm thinking about lowering the idle (I set it a little over 800rpm back when I had some idle hunting problems), also need to get around to doing some electrical work including a battery gauge (you can bet I'll turn the car off more when I can see the battery charge status!)