Ive got a 94 Ford F250 Turbo Diesel 7.3, not power stroke. I cant tell if my turbo is working. It pulls my lawn trailer fine but the fuel mileage is terrible. I get around 9-11 mpg with the trailer. I cant hear the turbo whistling when Im driving. The power feels fine, but its hard to tell because it always drove this way. Ive had the truck about 6 mos. Ive taken the breather off and spun it with my hand and it will spin freely. Any suggestions on how I can tell if its working. My neighbor said something about a acuator. I know I mispelled that. Thanks.