That’s still an awful lot of miles to travel for that. If I remember correctly Subway has the most locations so probably you can get better food by driving less.
As someone who likes a good Italian sub now and then, I'm always a bit impressed just how bad Subway can make its food. I can at least find something I'm OK with at McDonald's (though I probably won't eat a burger). Not Subway.
Though I have to confess to like their chicken teriyaki thing from time to time, customized to extra hot ;-)