[mpg_numbers_guy]

Electric vehicles aren't free mpg. To convert to mpg properly you have to consider the cost of the drive rather than the watts involved. For most people electric vehicles are more expensive to drive unless you can charge them at home cheap or have access to free charging.

For example, a person I talked to would spend $5 to charge their Prius Prime battery, for 25 miles. That's $0.20 per mile. At 60 mpg in hybrid mode and $3/gallon running on gas would be $0.05 per mile, making electricity 4x as expensive, giving them an equivalent mpge of 15 mpg, even if the Prius readout claimed "199.9 mpg".

Vintage vehicles are typically larger and less aerodynamic. A few models were produced for aerodynamic efficiency, but would be hard to find. And it would need to be smaller or more aerodynamic than the already crazy efficient G1 Insight. Drivetrain could be from a G1 Insight, but then you'd have to fabricate custom mounts, etc. for it. There's a guy on here who swaps Prius drivetrains into classic cars, but his projects take a very long time.

Aerocivic.com might be worth checking out.