I am thinking that using a synthetic low friction additive wouldn't be a bad idea. The transmission is one place that not only cops a lot of abuse, but also causes some level of parasitic loss of energy (this could equate to a percentage of fuel consumption and loss of torque). I've seen Slick 50 on the market for a long time but wasn't completely sold on it (it's expensive and it doesn't hold up any better than most other additives or even SAE rated oil). The test in the video I posted up pretty much confirmed that statement. But the Petron additive was really a surprise. Bit steep for a bottle but if it gives the result in that video, well I'd be prepared to hand over the cash.