Towing in od is usually a no no, however, the manual says not to only for the purpose not reducing engine braking efficiency. The gas of driving in 5th on the highway is killing me. 9mpg pulling a sxs atv. I have a 6 speed maual. The truck pulls fine. If it starts to lug, I drop it into 5th. What do u guys think? Am I putting my tras at risk to save fuel?