http://www.autotrader.com/fyc/vdp.jsp?ct=p&car_id=285549306&dealer_id=6562...
Here is the exact example of what I would buy in your shoes.
2009 Ford Fusion Sport 4 cyl with 5 speed manual. 24k miles on it. Asking $13k, offer $12k. Finance for 4 years and your minimum payment will be about $300 per month at zero down with tax and all factored in. I am not trying to "own the car" just pay off more than it is depreciating.
The car is 2 years old now so you can keep it for a max of 4 years. In 2 years it will have 75k on it, that is the time to unload it.
For comparison, a 2007 Fusion (2 years older) with 75k mile is worth $7k today.
Take your $12k purchase and subtract the $7k and this car could cost you $5k over 24 months or $208 per month.
If you just trade the car in and take the bad offer from a dealership of $1k less at $6k over 24months it still only costs you $250 per month.
Figure a set of tires and front brakes for $1k in repairs over those years (or average of $42 per month)
In my way of thinking you are hard pressed to consume $300 per month on this car. Yes, you are making a $300 payment but some of that may come back to you at the time you sell the car.
If they pay you $400 and you spend $300 on the car then you can spend the $100 on insurance.
If you can find a lease that offers 25k mile per year at a $208 to $250 per month than you may be better off but my guess is a lease like that will run you more like $400 to $500 per month, minimum, even on a simple car. You still have to buy tires and brakes for the lease car. Insurance on a lease car will cost more because it is newer.
MPG:
This 4 cyl and manual trans is rated at 20/23/29. At 23 combined:
$0.23 x 23 = $5.29 per gallon
20k miles will require 870 gallons at 23 mpg.
At $4 per gallon, 870 gallons = $3480 per year
$5.29 - $4 = $1.29 profit per gallon
$1.29 x 870 gallons = $1,122 profit per year. (or about the cost of insurance)
$5.29 - $3.25 per gallon (cheap gas) = $2.04 profit per gallon
$2.04 x 870 = $1,775 profit per year or $149 per month.
If all goes well with your 2009 Fusion, sell it is two years and buy a used 2011 Fusion.
Wash, rinse, repeat.
Here is another nice 2007 Milan with low miles but it is over priced at $13.5k. If you could get this priced at closer to $9 -$10k it could be a great deal for two years.
http://www.autotrader.com/fyc/vdp.jsp?ct=u&car_id=288975611&dealer_id=1147...