Best cheapest used 4WD or AWD that gets 25+ mpg on highway

Right now we are looking at $6700 I don’t want to pay more than $10,000 if we have to squeeze out a bit more… we have a cavalier that needs ac, an oil leak (loses a quart every 3 months or so) and rack&pin… so we might be able to sale that for around $500… so I am thinking the FWD with snow tires may be our best bet… I don’t want to deal with any heavy expense after purchase if something not be right …I have been looking at the matrix with AWD, what is their reliability? I have been looking at Honda Element but the gas with 4WD is around 23 to 24 highway… Subaru is also on my list… I will work with these ideas and check snow tire prices… thanks to everyone!