Let's do some "gazintas"!
4th gear (overdrive) in 41TE tranny is 0.69. And the differential final drive is 3.91. And the circumference of 195/65r15 base model PT tires is somewhere around 78.4 inches. That means the wheel has to turn about 832 time for every mile traveled.
First take the overdrive ratio and multiply it times the final drive ratio:
0.69 x 3.91 = 2.70 give or take
Now divide 2,500 rpm by 2.70:
2500 / 2.70 = 925.93
To change "per minute" in rpm to "per hour", multiply times 60:
925.93 x 60 = 55,555.56
Now, divide that by the number of wheel revolutions per mile:
55,555.56 / 832 = 66.77 miles per hour
For those with a six-grade Arkansas education, give or take a couple of mph due to the amount air in the tires, this is going to be the speed of most cars using the 40TE or 41TE tranny going 2500 rpm with 195/65r15 tires. Might be a PT, Sebring, Cirrus, Breeze, Voyager, Caravan, etc. The car model doesn't matter. Fuel mileage on the other hand, has to do with how much fuel is required to keep the car going at that speed. The PT is heavy and not very aerodynamic. 22 mpg seems to be the average for me no matter what PT I had at the time.
PS: If my six-grade math is right, at 4000 rpm in 2nd gear, your PT will be running about 47 mph. But I make no guarantees when it comes to "gazintas". Them bein' kind'a magical and stuff.