73 Dart /6 MPG

So today I went 120 miles round trip in my '74 Duster. Surface streets, a short freeway jaunt, then highway and mountain roads, starting at a couple hundred feet elevation and driving up through 3,500 ft of elevation and then back down. I got 13.3 mpg, and that's with a 400-ish hp 340 with a 750 double pumper, 3.55 rear gears and a standard 4 speed transmission. I was not driving gently either. My odometer is actually pretty accurate, but for this particular drive it's a non-issue as I've made it many times with many cars and am quite aware of the distance (matches the GPS too). I've also made the trip frequently with the Duster, 13 mpg is pretty much spot on average for it. I've gotten close to 14 (when traffic prevents a "fun" pace through the winding roads) and as low as about 12 (when a complete lack of traffic allows a thorough flogging of the twisties), but most of the time it's right around 13.

I would hope like heck a /6 could do better than 14.7mpg . I think 26 mpg would require a tail wind, a downhill run, overdrive gears and some wishful thinking, but I would be hoping to get a lot closer to 20 mpg depending on your particular set up and gearing.