Quote:
Originally Posted by Autobahnschleicher
I'm purely looking at tank to crankshaft here.
Depending on the speed you're calculating it at, it's still rather optimistic.
If it's a small engine and you're going fast, you might get that efficiency.
However this is not the forum for people going 150 km/h on the highway, rather 80-100 km/h.
Gasoiline has a HHV of 43 MJ/kg or 43000J/g, wich is 11,94 Wh/g or 83,75 g/kWh.
If I'm lucky I can average (!) some 300 g/kWh, wich is 3,58x as much or just under 28% efficiency.
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Toyota has it's most advanced Atkinson-cycle engine rated at 43% thermal efficiency. I don't know if it's in production vehicles yet.
And that would be at the flywheel, before any CVT and constant-velocity joint/ wheel bearing losses.
Mazda's Skyactive series reports some high efficiencies, however, that's without any engine accessory or powertrain losses.
Hopefully, members and new members will chime in with specifics, which will allow us to focus our microscope.