Hi,
Here's the Mini hybrid with four 160HP electric motors, that I mentioned:
(click on image for link)
The ICE charger weighs 1/10 as much as the original 4-cylinder engine. There is no transmission or drive train, and no conventional brakes. If the hub motors were ~40HP each, they would weigh even less and they would use less power, and so the mileage would likely be higher.
Don't forget that diesel/electric train locomotives are serial hybrids! The latest freight train claim is they can move a ton over 400 miles on a single gallon of diesel.