I have a 2510 (year 2002), with twin F-115s. I have the older MV hull (14 deg deadrise), and the two F-115s push her WOT at 40 mph, and I cruise at about 24 mph at 4000-42000 rpm and about 9.5 gph.
The newer version of this boat has the XL hull which is 16 deg deadrise. Twin F-115s would probably push her OK (barely), but I'd probably go with a pair of F-150s. The DV has a 21 deg deadrise, and if I had that, twin F-150s would be the absolute minimum, and a pair of F-225s would be sweet.
Rule of thumb is to not go below about 75% of max hull HP, else you end up over working the motor(s), at a higher throttle setting (meaning more fuel), and shorten the life of the engines. An engine loafing along, will be more efficient and last longer than one that is being over worked.
Twins are nice, if you can afford the maintenance (twice the cost). On two occasions, I've had to come back to the dock on one. Both times, were because I wrapped something around the prop so tightly that I could tell the motor was struggling. Once was a piece of floating line (maybe from a crabpot), and the other time was a fly line. Both times it was winter and I was not going overboard with a knife to cut them loose.
Dave
aka