Not all vehicles have the space and design that allow this process to happen easily. Luckily, it is the most gasoline-hungry cars that do. Pickups, SUVs, vans, and the like represent about 80 million vehicles, with mileage of perhaps 13 to 16 miles per gallon. Converting these should be our first priority. The instincts of conservationists have been to improve what is already pretty good—compact cars with decent fuel efficiency. Our national priority to decrease the amount of oil-based energy dictates that we go after the low-mileage part of the fleet first.
Estimates show that converting these vehicles to dual-fuel operation, even with electricity providing no more than 50 miles of driving range between daily recharging, could cut petroleum imports by 50 to 60 percent—a stunning opportunity.
