Baz, I'll try that next time I gas up the motorhome, that much of an increase in MPG would be very nice.
Bob, you have the dyno expertise, so of course, I will bow to that expertise. I just related to what I have done on my bikes with no ill effects, and the story was told by my engine instructor who has a wealth of knowledge on aircraft engines, akin to your expertise on the CIH. Absolutely, AVGAS burns much more slowly than automobile gas, the aircraft engines are usually redlined around 3750 RPM, so the fuel has more time to burn in the combustion chamber. Another story on burning AVGAS. While stationed in the Phillipines, I was heavily involved in bike racing, one of my competitors filled his tank with 115/145 AVGAS. After a half a lap at approximately 8-9000 RPM his engine siezed. Teardown revealed the piston expanded and scored the cylinder badly. It seems all he did was change the fuel and not the carb jetting. Also, at altitude the air temp is cooler and less dense, the actual reason for a turbo to begin with. I'm amazed the AFR was so low in the CIH motors, especially since the computer controlled engines are scheduled to run at 14.7 through all throttle settings. Thanx for the info, it should help those who would like to use an EGA in their cars. The Master of the CIH has spoken again.
