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I find P&G/DWL to be the most effective. I pulled down 49.54 MPG on a 341 mile trip on all hwy by doing just that. My average speed was about 52 mph (it was a long day) No Drafting (My car was full of stuff for school too, so it was significantly heavier.) I normally get around 40 MPG's with a mix of hwy/city driving.
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