The biggest problem of the 767 is the high range. The further you fly, the less profit per pax per mile you make.
There's a timeframe where this makes sense because fuel is cheap, competition less and demand is low. I can imagine a few airports where the 767 is the perfect aircraft.
For most people they can utilize A310-300 (it's ok after the last update) because they already have A300 fleetgroup or use their DC-10 and L1011 and oversupply the demand a bit.
Unfortunately AWS reality is: Random big airline out of a major airport throws random 767 variants on high demand routes.
753 is relased ~1999, if you still fly big amounts of 767-200 this time, you are either sticking to an extremely thin fleet commonality (2-3 fleetgroups out of a smaller airport that can't serve a bigger long haul aircraft, so you can't go for A300 or 757) or you're doing it wrong.
So, has the 767-200ER a superior range? Yes. Can it make profit on those routes that can't be covered by bigger aircraft beyond 1999? Not much.
I didn't see myself posting this to you. I haven't seen you playing for a while, but as far as I remember you are one of the players who exactly know which aircraft is the best at what time to optimize their airline.
Bummer if this has changed and you fly 767 out of JFK. But for Puerto Plata it's perfect, one of the few airports it fits very good.
Question on this: Fuel prices are (very) low yet in MT7, but how long do you think you can keep your 762(ER) routes like to Doha?