I used about 21/2 gallons to winterize my last fiver at 39'. We now have our Fleetwood Expedition at 42'. We also have the washer we didn't have before and a fridge ice maker but have that line discon...
$170 sounds cheap to me as it cost me $300+ to winterize my 42'. That's the cost of fuel to get it to south Fla.:B I've had good luck just putting 100 psi air on to blow ouit the lines by not closing all the valves at once.