Well the problem with toxic fumes and dirt, is a problem of the particular fuel, not the stove. Oil company add stuff to let the fuel run better in the engine, good for the engine. Bad for your health when cooking with it. I only see car fuel's as a emergency fuel source for mine stove and use proper clean fuels for mine stoves.

I have use both one and two piece designed stoves. They all work. I personally do prefer optimus(Bruton is the US?) and primus. The plastic pumps on the MSR just don't feel right and i had a piece of plastic broken off mine old MSR XGK pump. The two piece design is easy to pack, but obviously has piece to assemble.
_________________________