I have been driving my truck more now that fall weather has set in, and I really like the way the dual W-1s are working. Not only is the fuel milage better, the over all feel is better. The engine is much smoother in all gears. I haven't checked milage yet since the gauge just came off full after 140 mile trip. It's never gone this far on so little fuel. A couple more weekends of driving and I can top it off.
Joe