Hi MrJim; It's not hard to get 28 mpg. First, I converted the Cessna to a taildragger, quite a bit cleaner without the nose gear. Next, I have flap and aeileron gap seals. Wheel pants. Small tires. And finally, a prop that's been re-pitched to super-cruise. It's like having a 6th gear in a 5 speed car. Also, I keep the plane highly waxed & polished to minimize parasite & induced drag. I'm jealous though, of your Mooney. I have raced Mooney's in efficiency contests and greatly improved their MPG. For example, do a google search about the CAFE 400 in Santa Rosa, CA. I was involved in this for many years back in the 1980's, and was close friends with Mooney president, Roy LoPresti and his wife, Peg. I was at his house in Kerrville, TX prior to him moving to FL.
For HickoryNut, hey, very nice job! For sure you have enhanced the usable life of your hog, and it will look much nicer also! Now, how does your tractor look?