Smooth and flat wheel covers are quite helpful. You can also seal the hood gap with some soft foam gasket that has the adhesive on it.
Do you have the auto or the manual shift? Are you coasting in neutral and/or downshifting to slow down? If you put the front defroster on at all, you get A/C which kills the FE. I just unplug the fuse; but now the coolant has leaked out after a couple of years without any use.
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