Road beer

Drain all that nasty ethanol out of the radiator and fill it with water, crushed malt, and hops. Drive to and from a specific destination (say, Newcastle) noting the time of boil. Upon returning to your own driveway, lovingly drain your radiator. When cool, pitch the yeast and cover. Allow to mature, bottle and refrigerate as usual. Serve to your pals as Newcastle-And-Back Ale.

Try different destinations. Liverpool may yield a bit more body. The time of boil won't be the only variable here; terrain will also influence your finished beer. (Figure on a 10% increase in distance over the flat compared to a mountain run.) Seasons should have minor impact assuming your thermostat is functioning properly.

Please, let's not get any silly ideas about combining this with your normal calls pushing buttons and zippers in your three-county sales area. Brewing is an act of love, not to be tainted by the crass.

On the other hand, you could keep an eye out for either small mammals or birds along the wayside, to serve as a supremely authentic side dish. (But avoid stopping early since the steady buildup of heat is crucial to a successful brew session. Just jot down their locations and pick 'em up on the way back.)