Question edited into written English.
Question moved to model category.
Wow, that's bad!
Someone stealing your fuel? Hole in the fuel tank or lines?
The stats say
Regular Gasoline
EPA Fuel Economy 17 MPG combined city/highway (15 City, 22 Highway)
5.9 gal/100mi
359 miles Total Range
https://www.fueleconomy.gov/feg/Find.do?action=sbs&id=25378
You need am auto electrician with a pro grade scan tool computer to check long term and short term fuel trim, check MAF and o2 efficiency. With that consumption your spark plugs should be black, if the engine management system is dumping fuel. The other possibility is that you are 'lead footed', racing from traffic lights, revving through gears, using 'kick down' all the time, and stomping on the brakes at the last minute. That would easily shave 50% off normal consumption.
https://www.google.com/search?q=2009+dodge+journey+bad+gas+economy
For the passenger heating, that one is easy, blend doors stuck, blend door actuator failed, or a linkage has come off. Videos show how to get there and check.