I pull a medium sized trailer (14ft single axle with about 1200 lbs of stuff) on the hwy often. Unfortunately, I have been doing this with the trans (700R4) in OD rather than Drive - my bad. It's likely the cause of my recent tranny failure. I'll now be pulling with the tranny in Drive My question is should I expect a dramatic gas consumption increase ? Seems the higher RPMs are going to consume more gas. Any thoughts ?