At least as a VIIb is concerned, at standard speed (14 knots) your max range is around 6900 km, whereas if you just lower it a bit to 1/3 speed (10 knots) you're range increases to 13k. Using the manual setting for speed 8 knots is the sweet spot in terms of fuel effeciency and range, you get almost 20k max range.
Depending on the year, there's some spots that you can pretty much just camp out in and actually use the patrol patterns and get frequent hits - like the Irish Sea, North African Coastline, Straight between Tunis and Sicily, the Gibraltor straight and whole area west of it. If you're lucky you might run into a whole convoy, but at the least you'll usually catch several pairs or 3-4 ships going together unescorted.
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