r134a
R134a
A 1999 Jeep uses R134a.
I don't know what average miles per hour is, but max speed for the 7.3L Powerstroke Diesel is around 105 miles per hour. And if you meant to type miles per gallon (mpg), the combined average of a 7.3L Powerstroke is from 17mpg to 19mpg.
R134a
134A
R134a
A 1999 Jeep uses R134a.
134A refrigerant which can be purchased at WalMart or any Parts house.
R 134
R134a refrigerant.
R134a
The refrigerant they would use is R134a.