I spent the last week testing tilt rotors on my TriPlane, and did not have much luck. For whatever reason, the motors draw more amps the further ahead I tilt them. I went as far as 45 degrees and can achieve much higher flight speed (up to 30 m/s), but the amp draw is 35+ amps. I was tilting the rotors manually for testing, using a VR knob on my transmitter.
The combination of an extra 350 grams of weight in servos, tilt motor mounts and wiring caused the hover amps to go up to 22-23. And provided no advantage in forward flight at all.
The most efficient configuration I have found is to reverse the direction of rotation (from the ArduCopter documentation) of the wing props, leave the rotors at zero tilt, and fly at 9-10 m/s. My battery will put out 13 amps for 45 minutes of safe flight time with that configuration and gives me a range of about 16 miles.
It has been below zero here much of the week, and I made an insulation blanket for the battery for cold weather flight testing:
I gave up on the tilt rotor system on Thursday because I could not get the results I hoped for on this aircraft. After reassembly, I ended up with a resonant "buzz" someplace in the monoque aluminum airframe that I have to find and fix. And I have a problem with the gimbal shaking in cold weather from the air flowing over the camera at flight speeds > ~5-6 m/s. I never had this problem with the gimbal in warmer weather.
After reassembly I made a short test hop this morning and am back to the same results I started with. With the Pixhawk I am also getting a severe "jerk" passing each spline waypoint. I don't recall having this problem with the APM. I made a video of today's test flight since it was a little warmer here. I recorded the telemetry on my laptop from the tlog file after the flight, so the timing is slightly off between the real-time flight video and the recording of the telemetry data. But getting ~12-13 amps in cruise, I consider quite efficient for an aircraft of this size. And tilt rotors are definitely not the way to improve it. The tilt rotors only increase the airspeed. They do not provide more range.