Let's say you get an old truck that gets 5mpg with your trailer and you do 100 miles once a month. That's 20 gallons a month, or $80 a month if you multiply that by $4 per gallon. So if you own it for 5 years that would be $4,800 total. If the truck cost you $1,000 and you had to do $1,000 worth of work to it you're now at $6,800 total after the five years, plus tags and insurance.
If you get a truck that gets 10mpg, you'd break even if the truck is $4,400 and needs no work.
You'd also break even if you got a truck for $5,200 that gets 15 mpg while towing.
A 20mpg truck while towing would have to cost no more than $5,600 to break even.
Of course the farther you drive, the more fuel costs per gallon, or the longer you intend to do this every month the more it makes sense to get the newer, more expensive, fuel efficient truck, at least from an economical standpoint.
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