Petro-Chem Fuels are the common form of "Gasoline" (Petrol substitute, actually) that's been mentioned in the fluff back in the day. A bit of Petrol with a lot of chemical fillers. Bio-Diesel is a big one, and is likely to have a Aviation Fuel equivalent.
Most ground vehicles are hybrid vehicles, electrical energy at low speeds, Petrochem engine for higher speeds or acceleration. This is what GridGuide connects to and provides power to (This limits accel rates, BTW.). Military vehicles, and ones designed for off-road or highway driving are likely to be Multifuel Engines (See Arsenal, Page 140), which can use pretty much whatever will provide enough oomph in the cylinders (I've heard that some forms of weed killer will work! Not well, but...). These work best on Diesel (Bio-Diesel again), apparently, as they're heavily based on Diesel Engines (Which will run on quite a few different things without extensive modifications!).
Petroleum is still a major commodity, however, and the Megas fight heavily over control of oil bearing areas. S-K is the major power in the Middle East, IIRC. If my geography is correct, the Athabascan Council lands hold the (Former) Alberta Tar Sands that has a drekload of petroleum available. The Trans-Polar Aleut is likely sitting on large deposits as well.