Frank, I've had several vehicles on LP gas. They will pull harder and generally have more low-end torque, but never seem to have the power at highway speeds. However, you can advance your timing several degrees from stock. One way to do it, without a dynometer, is to advance your timing a degree, or two, then drive it. I like to take my vehicles out for a timed run. If that goes well, do it again, until you see no improvement in performance. I usually retard the ignition one degree afterwards, just to be safe. Worked for me!
