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With a few tanks of fuel through the truck with the underdrive pulleys installed, I have noticed 1-2 miles per gallon improvement in mileage. Nothing is real big in mileage improvement with a full size truck. It has been one of the best improvements to date. Engine coolant temps are normal and the power steering feels just the same as before. The alternator is running 14.1 to 14.7 volts all of the time. Will be running a ground directly from alternator to the negative battery terminal in the next few weeks.
Next up is new tires from Bridgestone with their new LRR rubber blend. More of a SUV tire instead of a light truck tire. I seldom haul anything and never tow since the sale of the family ranch.
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