One problem is both cars are off the ground so how tall leaves out the open space under them.
Plus the avg. Explorer has much more road clearance so it is taller but not bigger.
Plus the 2000 Mercury at 1700 RPMs got 30MPG at 65MPH
The Explorer at 1500 RPMs gets 30MPG at 50MPH
I firmly believe it is engine RPMS that matter in these cases.
Rich
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