If you have the smallest engine available, you're going to have the least capable transmission too. If you're doing a lot of towing then you're going to eventually have transmission problems.
That said, getting the transmission overhauled might be your best bet. Sure, the engine's working hard when towing, but it sounds like it's capable enough. The transmission made it 70k just fine. A reman unit lists for just under $3600- pricey but with an 80k warranty. An overhaul won't have the warranty but should cost a lot less. You're probably not going to get much better mileage with another truck. Your work truck is capable enough for the work you need it to do. Ditching it doesn't look like the best move.
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Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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