That and the higher efficiency of diesels (assuming you're talking about little planes). Still it's a really long road ahead. For GA aircraft I think a better s

That and the higher efficiency of diesels (assuming you're talking about little planes). Still it's a really long road ahead. For GA aircraft I think a better solution right now is a drop in replacement for 100LL (which is getting worked on) or getting leased engines certified for mogas or modified to run on it.