It depends on you? If your not a speed freak and intned to keep your rig for a long time, then the 225 Opti is a nice motor. The only real choice we would make on the present 20 lines are either a 225 Opti or jump to the 250 Pro XS. Some go with the 225 Pro XS, though the percentage of sales on the 225 vs. 250 are minimal. Fuel mileage wont make much difference from one to the other really. The 250 does burn more fuel, though at mid range they are all close enough to not matter. BCB