All you guys saying that "shifting into 4th at 55 mph doesn't compute" don't know the RT. The OP never said he was shifting at redline. 55 MPH corresponds to about 4,700 rpm in 3rd and 3,700 rpm in 4th. The hexhead engine will pull hard without lugging at anything over 3,000 rpm. It's possible to do a very sharp acceleration up to about 90 mph without ever getting over 4,700 rpm, more than enough to chase down a speeder. Ride one and do a spirited, but not WOT, acceleration, and shifting at 4,700 rpm feels quite reasonable. It's a tractor motor, not a peaky thoroughbred.