PA-34 pilot reported executing an off-airport landing after both engines failed in flight due to fuel exhaustion.

Narrative

The aircraft was coming out of an annual. We had topped the tanks in ZZZ2 after getting a pitot/static inspection. Flew the plane back to ZZZ3 (15 min trip) and after an engine run and one flight in the pattern I filed an IFR flight plan and departed for a 3h trip to ZZZ4. The plane showed 123gal usable. While on a flight home from ZZZ3 after buying the aircraft; after deviating around weather I decided to shorten the leg and land in ZZZ. Average burn was less then 12 gph/per engine. I started the descent with the fuel gauges showing between 10 and 20 gallons which was confirmed with planning and JPI fuel/engine monitor. During the last part of the descent into ZZZ the left engine sputtered. The left fuel gauge showed near empty. I switched the left fuel feed to the right tank that was showing better 5-10 gallons; and the engine came back to normal. Looking for the nearest airport; I turned and went direct to ZZZ1 which was 10 miles to my back right side. I had descended to 2700'; requested priority handling with ATC. In the next few moments; both engines failed. I looked for a suitable place to land since I could not glide to ZZZ1. I left the gear in the UP position and touched down at or very near stall speed. The plane slid approx. 100 yds to a stop. No injuries. Total Flight Time 2h 45m. The plane showed that it has 123 gallon of usable fuel; but it acted like it only had 96 usable gallons (standard).