I recently received the all-Natural Gas Express van. It starts and runs well on Natural Gas. You only lose two things. Low end torque is very, very low, so it starts up slowly, but that doesn't bother me. What bothers me is the incredibly short range. I ran it until 5 miles after the "low fuel light" came on, and got 140 miles on a tank. A tank holds less than the equivalent of 12 gallons of gas, and it gets 12 mpg. Since our van runs 100-150 miles a day, that means we will have to fill it 1-2x a day, and with only a couple places it can be filled, the result is a bad joke.