Even if it could run on diesel it wouldn’t be viable, since you’re unlikely to be able to obtain diesel on an airfield. I think one object with these engines is not only to lower costs, but also to cater for the increasing lack of availability of AVGAS 100LL in many countries. With this fuel containing more lead than any automotive petrol ever did and a decreasing worldwide consumption making production increasingly financially uninteresting for oil companies, diesel engines could be the future, given that JET A1 is available almost anywhere. As regards MOGAS, “my” airfield recently enquired with BP whether it would be possible to set up such filling station on the airfield. When they learned that expected sales in a year would correspond to the weekly sale of a garage forecourt station, the answer was no…