Another vote to at least look at folders. I have a Bike Friday Pocket Rocket, and it feels just like a regular bike to ride -- I did a century on it a couple of years back, and am using it on a 2-day, 160-mile charity ride next month. It's only when I look down and see the silly little wheels that I realise it's a folder. It is not a quick fold like the Brompton or the Tikit, but it does a quick partial fold, which would take less space in a cab.
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Zero gallons to the mile