Well I got back and My A/C still works!! yey!!

don't know how long its going to work but crossing my fingers that it works till next summer! if anything I will fill it up with one more can (since it takes 3 if completely empty) the best part is that I had the best mileage EVER! I got 641 kms on one tank of gas!!! so 641kms on 49.5 Litres of gas! do the math

on the way back I got 580kms with a little traffic.. keep in mind this is 99.5% highway.
If anyone has crappy A/C its worth to try this route first before taking the expensive route.. $33US is a lot less than $300Cdn..

cheers
Martin