Hey Wolfram,
Do you have any vague idea of the nutritional specifics for that particular sub? I'm perusing the Subway website, which lists some nutritional details, but doesn't account (I believe) for variations.
Subway website is here.
Under six inch double meat turkey breast, the website indicates 330 calories, 50 grams of fat, 48 grams of carbs and 28 grams of protein. But I don't know what that sub is supposed to include.