[FabHK]

A good rule of thumb (in general aviation at least) is that anything aviation grade is about 10x the "normal" price, or more.

[Robotbeat]

Fuel isn’t. Jet fuel is basically no more expensive than diesel and sometimes cheaper (no road tax). You can consider batteries basically like jet fuel.

[_0w8t]

In Norway jet fuel costs like 3 times less than gasoline due to absence of taxes. For these reason some amateur flight school use small planes with jet engines, like DA40NG, to get much lower operational costs. It can be even cheaper to fly such plane than drive a car.

[throwawayboise]

It's the same order of magnitude, but aviation fuel is more expensive than motor vehicle fuel (standards are higher for one thing).

https://www.globalair.com/airport/region.aspx

The chart linked above does not include additives which may be required such as anti-icing/anti-gel.

[saddlerustle]

Batteries are more like fuel tanks