I have optimized my Comanche Pa24-260 LoPresti GTO over the past 16 years - Great performance for a normally aspirated Comanche - down low 175+ KTAS @ 16 gph, and at 11,500 msl 163 KTAS @ 11.3 gph. But, for more comfort (built in O2, Cargo doors, AC) and speed, I am looking to upgrade to a...