Welcome!
Less weight will help, water beds not so much. If there are a bunch of back seats that are rarely used remove them, it will help, and those running board/fender flare thingies don't look very aero, and it might help to remove them too. If the speed limit on the freeway is 70, then get in the right lane and go 65 or even 60 it will make a really big difference. Speeds over 60MPH really start sucking gas.
Later,
Allan Greenblazer
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