Ford F250 Deisel Crew Cab Year 2000 with 9500 miles on the engine is decreasing mileage from 19 - 22 mpg down to 15.8 mpg over a month's time regardless of highway or city driving. Any ideas about the cause or solution?

 

check your air filter

the PSD pulls a lot of air through the filter so it is only going to last about half as long as one on a gas engine

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Ronnie Hartzog
Houston, Tx
2000 F250 PSD
1973 VW THING
1996 New Vision 5th Wheel
2000 Kawasaki Prairie 4x4

Former Rides
1999 F150 Sport with FQR
1992 F150
1989 Chevy S10