Hmmm. An Ovation with 130 gallons aboard is pretty much a single-seat airplane. It'll go forever, but it won't haul much.
I don't have the long-range tanks, but with 89 usable I can only carry 495 lbs at full fuel. Add another 41 gallons and I'm down to about 250 pounds.
Also, at 155 KTAS, it'll take 13 hours. A 30-knot average headwind is the max you can do, and that'll lengthen the trip to 16 hours!
There are only three planes I can think of that can do it SP and without a onerous FAA approval of a ferry tank.
Mooney Ovation (2400nm)
Swearingen Merlin IIIB (2600nm)
SJ30 jet (2500nm)
Y'know, I'm not buying 2400nm for an Ovation, even with the 130-gal tanks. With a 45-minute reserve at 8 gph, that's 124 left, or 15.5 hours. 15.5 hours * 155 knots = 2402.5.
But, it's going to take you a lot of fuel to get to 18000 feet before you can get that kind of economy. My fuel burn on takeoff is 25 gph. Leaning during the climb, I'm back to 18 gph at 10,000 feet.
A max-performance climb to FL180 in IAS conditions, according to the POH, will take 8 gallons, 31 minutes, and 65 miles. So, we burned an hour's worth of our cruise fuel and knocked 90 miles off that 2402.5 miles, so we're at 2312.5.
They also show 8.3 gph, not 8, as the fuel flow up there. Doesn't sound like much, but on a flight this long it matters. We just lost another 87nm, so we're at 2250.
Of course, that assumes book numbers - I don't think I could make it to 18000 feet on only 8 gallons, though I might have to test it next time I go that high.
With the flight from Little River to Hilo being just shy of 2000nm, it looks like we're down to about a 20-knot max average headwind if *everything* goes just right. No thanks!