Thing is, I had intended to use two kinds of power generators in my ships and flying vehicles. I figured huge ships should have a different power generator than starfighters and Leonardo's taxi, which use fusion. For one thing, the big ships are supposed to implode-explode when a powertron is ruptured in battle. I had therefore envisioned powertrons to be big enough to power warships and big enough to make them an important target in warship-on-warship fighting. The power source in small vehicles can't be that dangerous since the cab gets damaged a lot in Leonardo's chapter, both from enemy fire and his crazy driving. Remember suicidio mode?
There are other examples besides the taxi.
Fusion for spaceships is great.
You mention fusion for cars. Let me get really techno picky on this one. Fusion implies huge temperatures like the sun. You might want to refer to it as Cold Fusion (CF). Or call it Low Energy Nuclear Reactions (LENR). Both these concepts are being struggled over internationally. It's not made up. I like LENR, however, you will need to somehow really establish the name. You'll probably have to define it a couple few times. Or call it the LENR Drive or LENRD (pronounced Leonard). I was trying to figure out LENRDO (Leonardo!!) but failed.
If this is too much then fine.
