My Diesel Truck Gets Bad Fuel Mileage After Dealer Reprograms It

<p>2000 Ford F150 Stalls while driving.<br /> 2000 Ford F150 Stalls while driving plugged converters?<br /> 2004 Nissan Frontier Idles fast. 2014 Nissan low oil pressure light is on.<br /> 2020 Duramax Truck gets less mileage after the dealer reprogramed it.<br /> Does a car get better mileage when tank is full?<br /> 1986 Camaro Carburetor wants LS conversion or fuel injection. Buying and driving a Ford Maverick.</p>