[wstuartcl]

+ if the Toyota engine fails in a car you tow it to a shop -- if the 172 engine fails you emergency land in the best case (or crash in the worst). There is just a whole lot more onus to work on plane engines and that should and does come with a price tag...

[jojobas]

Their mod of a car engine is claimed to work with 4 failed cylinders out of 8, has redundant ignition and fuel injection.