Last weekend, I drove from VA to FL and back. Roughly 1000 miles each way. On the way down I had the cruise control on 75 and averaged 18.5 MPG. On the way back the cruise control was set at 80, averaging 16.3 MPG. Thats a whopping 12 percent drop in fuel mileage.
I offer that as evidence that driving north is in fact, up hill.
I offer that as evidence that driving north is in fact, up hill.