At Boulevard Tires, the jumpsuit-clad mechanics are happy to lead a customer past the greasy plastic curtain that separates the waiting room from the garage. There, they'll submerge a flat tire in a vat of water to locate whatever nail, slow leak or pothole puncture set the customer a-walking. If the damage is irreversible, they'll sell you a used tire for less than $20 and run to a salvage yard to root out a matching wheel, if your car needs one. These fellas are gruffer than their corporate-chain counterparts — during one visit, one mechanic is overheard telling a caller, "Nah, I'm just some drunk who works here" — but their no-frills service is also no-bullshit. And that's more refreshing than a radiator flush.