Quote Originally Posted by Thymeclock
Unfortunately, when there is traffic it is impossible to break 45 – thus the car is spending most of its time in first, second and third gears at best, and it virtually never goes into high gear, which would yield the best fuel efficiency.
Presumably when you finish accelerating, to let's say 40 mph, you back off the throttle from 35 TPS to cruise at a constant speed, and your TPS value would drop.

Are you saying the transmission still won't upshift at ~40 even with the lower TPS value at cruise?