250 HPDI or 300 HPDI

[zup]

I am in the process of repowering a late 90's 23' center console. I am torn between the 250 HPDI and the 300 HPDI. The price difference is minimal and the 300 uses aprox. 20% more fuel than the 250. Anyone have any performance numbers for a similar setup. Also I have heard rumors that the 300 HPDI is not actually 300hp but more like 280, has anyone heard the same thing.

Thanks for your help.