It's not quite as a dramatic a difference as it appears - most petrol engines are going to be in the region of 30% efficiency, vs an electric motor at ~80-90% (or perhaps more?). Still, talking 5000Wh equivalent to 250, or a 20x difference (which is about in line with most real vehicles, I think? 1 tonne battery packs vs 50L fuel tanks)
> most petrol engines are going to be in the region of 30% efficiency
It’s worse than that. A recent Yale study found that—for an average car on the road—from $5 of gas you’re really only getting $1 of that energy to propulsion.
You sound like you haven’t enjoyed the thrill of owning an old British car.
Fuel sloshing out or mangling the handling on cornering was a feature of British Leyland. I miss my cursed ‘68 Triumph 2000.
You could use a metal-air (such as Al-air) battery for this. You'd get _much_ better range than any lithium battery will give you, except it's not rechargeable.
