Wow, that is weird. For a partial fix, turn the vehicle on and off, and the max speed will update to 62kph. That is at least a decent ramming speed for 1-2 smaller zeds. Large Electric and the V12 give similar speeds.
It looks like someone goofed up. I wouldn’t know where, though. In the meantime, a decent looting vehicle is an Electric Car. If you keep the weight under 1500kg or so you can travel 100 map tiles off of a single Storage Battery as long as you only go 32kph. Going 64kph doubles fuel consumption per distance traveled on electric, going 96 doubles fuel consumption yet again.
Recharging a single storage battery requires about 74 hours or 5 fifteen hour days of straight sunshine on 1 Quantum Solar Panel, or 3 Upgraded Solar Panel, or 6 Solar Panel. The Electric Car is made out of Lightweight Frames to start and has 24 tiles. Fill all tiles with Solar Panels and you can fill a single Storage Battery in just under 20 hours of straight sunshine (or 1 and 1/3 days of good weather).
Lastly, Rollerblades are a tad OP at the moment. They are faster than the fastest possible muscle vehicle, and when sprinting can reach 96kph WITHOUT traits. Have lower weight and similar volume to a folded bicycle. While waiting for your ride to charge, nothing beats rollerblades.