Cold weather starting

What's -15C, around 0-5 F? Shouldn't be any start issues at those temps. As for drygas, if that's what you're using, it's a waste of money. If you wanted to put something in the tank, use a bottle of fuel injector cleaner or some other fuel system cleaner. You wouldn't be getting any condensation in your tank anyway except under extreme temp swings and even then it's highly unlikely, I've never used it in a newer vehicle. In older cars, early 70's and before, with those fuel systems, it was more common to have problems. If you insist on using the stuff, use the isopropyl rather then the methanol. Your fuel filter should be located in front of the right rear wheel, attached to the frame with a clamp. New one should come with the hairpin clips. Relatively easy to replace, make sure you de-charge the fuel system of pressure. Inertia switch in your wagon should be behind the little drop-down door panel in the right rear of your storage area. Move the sound-deadening material out of the way, you'll see a little black box, usually with a gray electrical connector, unplug that, crank the engine until no more firing, pressure should be relieved. Any check engine light on?

A buddy of mine lives up in Calgary. Down here in upstate NY it's been around 20F below zero wind chill yhe last couple of nights. Air temp right now is about 0F, is your car cranking over and not firing? Do you have any way of testing fuel pressure? I would probably get it to a reliable repair shop, the dealer if need be, and have them look at it, it's too friggin' cold to be farting around unless you can get it into a garage out of the weather. Check all the easy stuff, sparkplug wires and connections, as many sensors and connections as you can. How about if you hold the gas pedal to the floor, will it start?