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Weight is only your enemy if you let it be.
Weight is not the enemy, braking is. I borrowed a garden trailer from a DIY place and actually got a record trip MPG on the way home with it loaded (probably about 700lbs of trailer for a total 'train' weight of 2.3 tons - 5.6l/100km (~42MPG)). The return trip was slightly worse at 5.8 with the trailer empty. Keep in mind too that a trailer adds aero drag and CRR too. Do I really think the trailer improved my MPG? No, but it's clear it didn't really hurt.
A heavy car simply stores energy, it's up to you to use it wisely. I'm thinking about getting a set of big heavy alloy wheels so I'd be able to neutral coast sooner without slowing down too much.
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