Since the looming demise of 100LL has been in the news a lot lately, I was wondering if someone (Peter Garrison?) might write an article on potential engine designs to avoid the problem of finding a new fuel.  Much has been written on the complexities of developing an acceptable substitute for 100LL that will work in our GA fleet of piston engines, but I haven't seen anything about developing engines that could one day be retrofitted in place of them to burn Jet A.  Why couldn't I have a 200HP turboprop in my Mooney 201?  What about a small turbo diesel like Cessna is putting in its new 182?  In order to make general aviation succeed over the long term, we have to look at more than just making new fuel for old engines - could a new engine for existing fuel eventually replace our Lycoming/Continentals which were designed 50+ years ago?  Thanks for your time... Drew Morrison, Del Rio, TX