Compression Tank Top Hi Have Got A Little Motor Home Mitsubishi Canter 3.5 Ltr Diesel. It Wont Go Over 80 Kms Top Speed?

Hi have got a little motor home mitsubishi canter 3.5 ltr diesel. It wont go over 80 kms top speed? - compression tank top

Hello I have a few original Mitsubishi Canter diesel 3,5 ltr engine. It is usual to go over 80 km of high-speed, and then accelerate with a descent to win tough battle, losing the battle, for example, as a result of opposition from the wind slightly bowed head, all power, was Vic with an average speed of 60 klm QLD, took 26 hours to travel to 2300 KLM black smoke under any load. From now on and idle well and the engine seems to purr. Do not use oil or water, but chews large quantity of fuel per 300 klms with full tank of 60 liters respectively. They changed all the filters and change oil, and compression test of 300 psi in all pots. Doctor has a fuel additive that no change has yet shown. Can you help me? Looks Anxously Řepy. Robby