Several years ago I had an independent shop put a 95 inch kit in my 2001 Road King Classic, new cams, Screaming Eaqle slip-ons and a RevTech DFO tuner. Mine was the first bike that they put a DFO in, they wanted to try something new. They thought I would like it better than the PC. The bike ran great, but my mpg dropped from 42-45 mpg down to 36-39 mpg. After the first tank or two, I talked to the shop and they said that was the price of performance. In the years since, I have never had a tank of gas get over 40 mpg no matter how hard I tried. I haven't thought much about it the last few years, and to tell the truth haven't put too many miles on the bike in the last 4 or 5 years. I joined this forum recently, and have been doing a lot of reading, and learned that the DFO is made by Dobeck, and have read just about everything on the site about tuner settings. I have been really impressed by the effort Dobeck puts into working with their customers. I had a couple of questions for them, but it was the weekend so I waited and kept reading, and sure enough all of my questions had already been answered somewhere on the forum. I wish I had made a note of the settings I've been running all these years, but they weren't anything close to the recommended ones. My dials didn't look like some of the illustrations, so I wish there were more illustrations online, but when I finally got past that and got the settings at 3,3,4,4, I have been blown away. The first check was 41.6 mpg and the second was 43.05. Shazam! Admittedly, these were very small samples less than a full tank total, but still very encouraging. I just had it serviced a couple of weeks ago and had 37 and 39 mpg on the 2 tanks before the adjustment. Oh, well. Better late than never. Am going to keep an eye on it for a while, for the mpg and for performance. It seems to be running as strong as ever, and getting better mpg. Thanks HD TALKING!