You keep making assumptions for the sake of improving your argument.
My assumptions are actually pretty accurate
Take your claim: Buy a 4 year old vehicle and save all the depreciation! Fine, go for it. Let's presume you "drive the wheels" off of it, so how long is that? 150,000 miles? 200,000? 10 years? 12 years? For sake of this lets go 200k and 12 years.
So now you've bought a 4 year old vehicle with, being generous here, 50,000 miles. 1/3 of the life of the vehicle is gone by years, maybe 1/4 by miles. Ignoring any necessary repairs/tires/etc that need to be done you have lost 1/3. So you will replace it in, say, 2023.
And you're accusing ME of a 'straw-man' argument?
I've already explained in this thread: things like tires, repairs, etc are SMALL compared with new car payments. You buy something used and have it paid off, you are making $0 in payments, compared with $5000-7000 a year on a new car.
What do tires cost? $500 for a set? A freaking new transmission - MAJOR repair - will only cost you HALF that annual new car payment ($2500-3000).
Or you've bought a new car with 0 miles and you get it until 2027 in the same scenario.
So new, using that Forrester you paid somewhere around $29,000 and got it for 12 years. You buy a 4 year old, let's say this one:
http://www.cargurus.com/Cars/invent...lectedEntity=d374&zip=50318#listing=113691916 and you get it for $17,000.
Your depreciation doesn't mean a whole heckuva lot because you aren't reselling it until you've "driven the wheels off of it". Who knows what a 12 year old Forester will actually command in 2023, so lets ignore it. You've now paid ~$2416/year for the new one and $2,125/year for the used one. A savings, sure, of $300/year.
I DID buy a used (5 yr old) BMW convertible years ago; $40,000 car 'new' I purchased for $25k. It had 40,000 miles on it at the time.
I drove it 14 years, put another 100,000+ miles on it. I spent ~$500/yr on average in repairs; some years only a tune-up for $200-300, other years $1000. The car still looked fantastic when I finally sold it and got $4500 for it. So, the original owner incurred $15k of depreciation in 5 years; I incurred ~$20k of depreciation in 14 years. On average, that's 1/3 of the depreciation value per year.
I added up what it would have cost me to 'lease' a new, comparable BMW every 3 years vs. keeping and maintaining the one I had (repairs, tires, etc). Over the 14 year period, it was a cost difference of like $85,000 vs. $45,000 (including the purchase cost/depreciation of the car in the calculation, repairs, tires - even put a new convertible top on it and fixed up interior leather in it that was getting sun-worn). Note, that leasing that level of car might actually be cheaper than buying, because you'd incur ~$10k of depreciation if you bought/sold one 4 times during the same 14 year timeframe, or at least $30-40,000 of depreciation.
Over 14 years, that's $40,000 (or more) saved by simply buying/maintaining and keeping the car I had. That's FAR more than '$300 per year', it's more like $3000 per year. The caveat for me is that this was NOT my only car, so if it needed repairs, I was not renting something or stranded somewhere. It was one helluva reliable BMW - the E36 platform, which every mechanic I took it to called them 'bulletproof'.
So, if you make an HONEST assessment of the actual costs, you'll save TONS more money buying and driving something 5+ years. I wouldn't recommend keeping a car 10 years and >150,000 miles, unless you've got other transportation options because when things get THAT old, they will break down and do require major repairs. When you get to the point your vehicle isn't very reliable anymore and starting to cost >$1000-1500 per year in repairs, it makes sense to replace it. But most decent cars nowadays can run 100,000 miles easily w/o major fixes, IF you spend the money to properly maintain them.
I got rid of the convertible mostly because I wanted something smaller so I could fit both it and a motorcycle in the same garage bay....thus, the Mini. I do miss the open top to drive around in the mountains, though. Plus, the rear-wheel drive convertible had to 'hibernate' for parts of the winter.