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I think if you look through the EPA ratings of the various opposed designs that have been available here the mileages of those types seem to be lower than other types.
A lot of people seem to have become advocates of the OPOC engine but it like other engines with large reciprocating masses will see losses climb dramatically when they are operated at higher RPMs.
Bill Lear of Lear Jet fame dumped a fortune into trying to compete at Indy with a steam powered racer.
regards
Mech
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