Could you also remove the vehicle fuel category and put them into vanilla categories please? Mods like the Superheater use vanilla categories and thus cannot accept K2 fuel types
This would also mean the car's and tank's accepted fuel type would have to be reverted to vanilla
Edit: not even heating towers can burn vehicle fuel

I haven't run into a case where this would be desirable. Can you expand on the usefulness of doing so? Most vehicles in K2 have specialized fuel and don't just run on anything you throw at them.

Most K2 fuels aren't really "burnable" either, for tossing in heaters. I don't think lighting some DT-fuel on fire is going to help anyone.

I think there's some cases for looking at vehicles (and fuels) in general though. The maglev trains that Moshine has for example could use a patch to add a K2-style equipment grid. Dyson Sphere, Cerys, and Metal & Stars also add new fuels that need some figuring out for how they can better fit for K2 in my current playthrough. It'd be nice if some of those can be adapted to K2-style fuels, but generally K2 doesn't agree with putting things like nuclear fuel in cars so I haven't bothered.

DT and uranium fuel cells should stay as they are, I'm not implying those should changed, only the vehicle fuels such as the biofuel, fuel and advanced fuel to be turned into chemical fuel. It's mostly for compatibility's sake rather than for balance's or immersion (frankly I never bother with balance or minmaxing, I just do whatever feels fun).
There are also a bunch of other vehicle mods that only recognize vanilla fuel types, so we cannot use K2 fuels in them by default. Boilers and furnaces can already burn vehicle fuel, so why can't anything else?
Also nuclear fuel can't be made in K2 as far as I know (unless you wanna change that too wink wink)

Even if cars and tanks can accept nearly all fuels, it's still better to use vehicle fuel in them anyway due to the lack of penalties, or bonuses they provide