Ha.  OK, calling food a "fuel tax" is creative.  Silly, but creative. :-)

Still a fail though, for multiple reasons.  First, actual food isn't taxed at grocery stores in Colorado.  Only at restaurants, because it's considered a service more than it is food.  Second, that's irrelevant anyway since sales taxes like that go to the general fund, as opposed to the gas tax which is earmarked for roads.  Third, drivers pay the same sales taxes that cyclists do.  So do people that don't drive or bike.  Thus it's just the opposite of a usage-based tax.  It's not tied to usage of roads at all.  

A usage-based tax/fee is something that correlates directly (or very heavily) with usage of it, and where the revenues go to pay for something supporting that usage.  Like a tax on gasoline going to fund roads.  And motor vehicle registration fees going to fund roads.