Hi Dave,
Serial hybrids have batteries (and/or supercapacitors), and this is the basis for their strong advantage over ICE only vehicles. You can't compare serial hybrids to ICE only and ignore the electric mode -- this is why they are used, and it is why they are so much more efficient.
The corollary argument would be to insist that the ICE-only car has to use just one gear for the whole test. Hey, it wouldn't be fair to let it use it's transmission, because the serial hybrid only has one gear!
I'll take a serial hybrid with a discharged battery and you take an ICE and drive it in one gear and we'll see who gets better FE, okay?
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