Take the CD, my 'full size' van weighs 2.2 tons, and gets over 30mpg in all city driving (20mph avg speed).
In previous testing (over two years), I've found the weight of a trailer makes no difference to city fuel economy, it can all be accounted for in the aero drag penalty.
Don't brake and weight won't hurt you, and a heavier vehicle that glides further is actually much nicer to hypermile.
In short you can drive a heavy vehicle appropriately, with a draggy vehicle your only choice is to drive slower.
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