I had heard in the past soemwhere that the 0-2's were ferried across the pond on one engine. THis seems to speak to that point. With 150 gal, at 130Kts, you get about 1800NM on one fill up, and always have an extra engine to spare
Of course you're going to be sitting for 13 hours.
http://www2.hurlburt.af.mil/library/...et.asp?id=3432
The O-2 could remain airborne for about four hours using both engines and seven hours on one engine by switching fuel tanks. It had a top speed of 205 mph and a ferry range of 1,400 miles, but with an 830-pound payload, the range was 770 miles. The aircraft had dual controls with the pilot and co-pilot seated side-by-side. In 1970, production ended after 546 O-2s had been built.