Calculating the $ benefit of selling my new car

[Infinite Jest]

Hello,

New aspiring mustachian here. I am thinking about selling my 2015 Jeep Grand Cherokee to get something cheaper and more gas efficient but can handle winters in the NH, USA mountains. Having some trouble calculating the true value of selling and seeing where over time (if I kept the car) when i would breakeven. How do I figure out how much money i will have saved in 10-15 years in both scenarios?

Some (embarrassing) numbers:
$37,000 cost of car +$3,000 taxes/etc = $40,0000
Estimated selling price = $30,000
Years left on loan = 4.5
Amount left on loan $20,000
Interest rate = 2.99%
Estimated new (old) car cost all in = $10,0000
Estimated annual insurance savings = $600

[Car Jack]

Depends what you get.  A new Impreza 2.0 base sedan with a manual is in the under $18k area brand new.  That puts you ahead of the game right from the start.  30 MPG and with the manual you avoid the biggest issue with Subarus.....the CVT transmission.  This is Subaru's new global platform that other models will move to next year. 

[ejmyrow]

Can you live closer to everything and take the bus? That's what I'm doing now. If not, another thought is paying down your car faster so you pay less in interest.