NOT A FUEL HOG
Have you tried a Davis diesel head for your engine, or looked into converting an engine with a Davis diesel head?
In the past we have run a couple of these, and they really do (almost) double run time.
We flew an FP .40 with one and, it made the 40 min. round trip with a reg. sized tank- granted, this was in a LARGE modified sailplane, but we had a lot of fun taking it on road trips!!
Jetts