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THe extra weight in the 45e is a factor when accelerating...getting it moving is the major cost in energy. It can recover some when you slow down, but your best mileage will be when it's just cruising at a steady speed. Then, the hit for the extra weight isn't as big a deal. Cruising at a steady speed, the energy required is from drag, which, could be higher, but may not be much depending on the tires and their inflation levels.
Drag from the wind goes up exponentially with speed. A little increase can make a big difference in the drag factor.
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