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I have a long commute also so...
I played with my tire size untill I got a best case scenario at 75mph.
Not a hot rodder per say just going with speed of traffic mostly.
Lowering my engine rpm @ 70 mph untill I best used inertia and engine torque at that speed.
Now this resulted in a ride height difference of 1.75" so I installed a chin spoiler, and side skirts instead of belly pans. {those may have proved better not sure>}
Then I worked on aero by deleting the passenger mirror and folding back drivers side.
next I moved tail spoiler as far back as possible on the trunk
Next I added wheel disc covers.
Little things like a wiper shut off help little, but items like engine kill switch and push button start helped final effect by making P&G and engine off coast down easier and saved on motor mounts and clutch.
My POS can really coast engine off now and cleaning and relubricating drive line helped alot.
I hope this helps you some and happy motoring.
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