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Some i3 models, like mine, lack the internal-combustion engine and its fuel tank, and i3 enthusiasts call it the "BEV", for Battery Electric Vehicle. The one with the gasoline engine is the "REx", for Range Extender.

The REx models use an engine design based on one of BMW's motorcycle engines; as such, I'm pretty sure that it's not a diesel. The gas tank is only about two gallons; to qualify for EV tax credits in some markets, the battery capacity needed to exceed the energy available from fossil fuel.

That battery capacity for initial models is woeful by today's standards. The design started with 17 kWh, upgraded batteries in later model years doubled that figure. Mine is a degraded original with about 12 kWh available. Freezing temperatures can cut that by half.

I drive it like grandma and get more than 4 miles per kWh. But it was less $$ than a golf cart. (I learned about EV tire expenses after purchase.)