@DKStuck 

Ethernet has a maximum cable length of 100 Meters or about 328 feet, so 85 feet is not a problem if you plan to run an Ethernet cable and honestly that would likely be the best option.  Powerline will not work because Powerline does not work across panels, even if it's a sub-panel.  Also, the Metal walls could disrupt a wireless signal making performance in the garage poor.   

If running an ethernet is not viable you can try to use a Deco X50-Outdoor, which is our first Deco designed to be used outside, complete with weatherproofing.  Also in case you didn't know you can add up to 10 Deco units into a single network so if your home needs all 3 of your current units you can add an additional one for the Garage or even add an outdoor unit to cover your yard.

  @Carl 

 Ok I appreciate you input! I'm going to order Deco S4 and try WiFi and if not proper I'll try Ethernet cable. 
I was hoping PowerLine would've worked.

  @DKStuck for what its worth, i have a 3 pack of Deco S's set up in my house. the nearest basestation next to a garage facing window will show a 2-3 bar connection out in the driveway in front of the garage, however the signal appears to be strong, it can get choppy in the garage which is less than 50ft line of sight. i plan on running an ethernet out to the garage and setting up a wired backhaul access point out there. i will do a speed test tomorrow. ill get 450 Mbps wirelessly next to the satellite, and ill measure the speeds once i get out there. basically, sure it will reach, but not reliably enough for my needs. runnging a cable out there would be the best bet.