I would think that most non-electric vehicles run on biofuel. In fact, I think one of the main reasons that food is such as issue and that the masses eat processed soy and krill is that much of the farmland goes to biofuel rather than food production. Tomatoes and carrots are for the rich because very little land is devoted to growing them. Farms are either producing bulk staples like soy, wheat, lentils, etc or growing corn for biofuel. Even today, the great majority of corn is grown for feed, starch, sweeteners, oil, industrial uses, and increasingly fuel, and very little is actually consumed as a vegtable or as cornmeal. Biofuel demand is one (certainly not the only one) of the reasons behind food price increases in the last year. In a world like shadowrun where almost all of the fossil fuels are used up and the remains are shale oils that are difficult and expensive to extract, growing our fuel sources would likely put huge strains on the cost of the food supplies.