I'm just happy that Vans is offering different engine options. The thing that has me concerned about the IO-390 is that, according to Lycoming, the engine will not be certified for MOGAS. The IO-390 will be required to run on 100LL and/or a replacement fuel that has yet to be approved and will probably cost more then 100LL. Hopefully all of this will be resolved by the time I have to order an engine....