[MDimitri]

Mileage was quoted at being around 50,000 and as for Whaminator and Hotwash system, they can be used year round to keep your windshield clear of debris such as bugs, tree sap, dirt and mud. I'll let you in on a secret, did you know that when you fill (from near empty) your windshield wiper fluid you should add about 1/3 of a bottle of isopropal alcohol (rubbing alcohol - super cheap, about $1.50/bottle or less) to the resevoir, it helps when you have frost on the windshield and your in a hurry to go, it also gets rid of the bugs in the summer and helps remove dirt and sap. I've been using it in all of my cars for years and have had zero problems.

Cheers!