I tried water wetter in my 2010 Voyager with 600 miles and it works. I drained the coolant and flushed with distilled water. I used a 30% mixture of coolant with water and added 1 oz. of water wetter per quart of new coolant. My results were the temp gauge now sits just above the half way mark at cruising speed where before it was at 3/4. In slow moving traffic and red lights the cooling fan still comes on but cuts off quicker. I live in Augusta, Georgia and these results were in 96 degree temperature days. I am still not completely satisfied with how hot this bike is but this has made an improvement and for the cost it is well worth it.