Lets put this into perspective. We rotate who cooks dinner, the engine, the medic, or the truck/heavy rescue depending on the station. One piece goes. If you're driving a mile or two rond trip, how much is that really costing? Oftentimes we'll go after being out on the road for a call, before returning to the station. Sending a utility vehicle or a POV to the store is a horrible idea, since that crew member needs to meet up with the apparatus to respond, costing precious minutes.
If you want to argue the waste of tax monies, then compare a one mile drive to the store vs the various entitlement programs. I'm sure that for every legit recipient there are five that game the system in some way, and I'm being generous with that figure.
Payroll is where the bulk of the budget goes to, not fuel. You're arguing over pennies. Reform all of these entitlement programs, and hold those on these programs accountable, such as mandating them to find jobs within a certain time period, for one. Heck, even if you mandated the welfare recipient to be out of the house for eight hours a day, five days a week doing community service, instead of being allowed to stay at home, you would at least get some return on your money. Oh yeah, if they're forced out of the house and doing community service, perhaps they'll think about it, and realize that they could spend the same eight hours a day working, and making more than they're getting from the gov't. Just a thought.
Given that we're willing to run into burning buildings to save life and property, I think a trip the store with the apparatus to buy dinner supplies (not five trips to starbucks) isn't asking too much.