[cRiPpLe_rOoStEr]

Originally Posted by jojogunn

This guy set a record for a small diesel back in 1981: 156.53. He got better mpg with a gasoline engine: 157.192
I think the small diesel lost thermal efficiency due to less heat mass of a larger diesel

The California Commuter - World Record Holding 155 MPG Freeway Legal Car!

The majority of small Diesels on the market have a precarious power-to-weight ratio and a low specific power, and though it's rather negligible for stationary/industrial equipment it turns them rather unsuitable for vehicle applications.