Have the 07' with about 190k miles and the last couple months I noticed that my fuel gage doesn't seem to go below about 1/4 tank. I ran out of fuel a couple times before figuring this out. When I fill up the needle goes to full but as I run out the fuel it stops at about 1/4 tank. The estimated range on the digital fuel range seems to be more in line with fuel in the tank at around 50 miles to go (although 1/4 tank should read more) and will keep me out of trouble instead of using the gage. Any suggestion's? How hard to replace the sending unit? Any recalls?