Interestingly, I found that the airplane in question here, the Cessna 172 was actually sold with the Thielert / Continental diesel, but ended up cancelling it b

Interestingly, I found that the airplane in question here, the Cessna 172 was actually sold with the Thielert / Continental diesel, but ended up cancelling it because they were so much more expensive than the gasoline models that nobody bought them: https://en.wikipedia.org/wiki/Cessna_172#Special_versions https://en.wikipedia.org/wiki/Cessna_172#Special_versions