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I figured I would throw this out there in a new thread. This locator searches all the major truck stops. Just put in an address and it will display what there is and where, with detailed selections for jugs, bulk dispensers, and bulk dispensers near fuel islands.
Also, it allows you to display results per a route if you are long-hauling.
Good info, Steve. At this point DEF is available nearly everywhere; Wal-mart sells it!
I've seen it on the shelves at truck stops everywhere as well as auto parts stores as well. Wal-mart seems to have the best price for the jugs, $11.99 for 2.5 gallons of the stuff. You should get around 1,000 MPGs of DEF consumption.