Air filter
My isl 425 in my Newmar is not getting enough air, the air gauge back nx to engine almost closes up after driving 100 miles with a new air filter in it an I'm just getting 6.2 mpg I'm thinking about d...
Forum Discussion
I would aslo check the connection hoses to air to air cooler and the intake side of turbo also, if these start to collapse that can caues issues also. Seen this many times in over the road trucks.
