How does the GU manual 4.6 petrol compare with the TB42 carby? I am particularly interested in comparative stats when towing a heavy camper or boat. Does it lose power and speed on long hills? How would it compare with my GQ in which I can tow a three tonne tandem trailer up the Braeside range between Warwick and Stanthorpe in 3rd gear at 80 Kph on 3500 rpm. How would the fuel consumption compare with my GQ - 24.2 L per 100Km loaded to the gunnels and full roof rack, towing a KK,Charleville to Caloundra 110 - 120 kph. Any feedback from members who have moved from a GQ petrol manual to a GU petrol manual would be appreciated.