WHy the tuner?
Are you planning on driving all 250 miles uphill? Really the only couple of long grades out of town can be taken with the stock engine HP and they only take a couple more minutes while driving 45. Increasing the power enough to go 55 or 65 up the 5 mile long hill is only going to make you go 20 MPH faster on a 6 minute long hill. So driving up it at 65 will be like 5 minutes, 45 will take 5.5 minutes. So what is the huge deal?
When I drove my Ford Edge up the 6% grade I10 going from Indio east towards Phoenix, I was doing 110 in 5th gear at 5,500 RPM, on a 6% grade! That car really flies! Leave the fast driving for the quads, motorcycles and cars.
Fred.