Can having a proper functioning thermostat affect mileage?
Mine was messing up so I just took it off and I haven't gotten around to putting the new one on yet.

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http://www.libertyagrifuels.com
1984 300D Turbo
1980 300SD Sold
1983 300TD Sold
Dagger 16 ft. Legend Canoe (for the weekends)
Marin Northside Trail Mtn. Bike