Sorry, figured it out. I had hoped I deleted it before someone responded
Anyway, here's my notes if anyone's interested.
Using this engine:
FTR Internal Confinement Fusion Drive E780
Power Output: 69 Explosion Chance: 60 Efficiency: 78 Thermal Signature: 11.04
Engine Size: 1 HS Engine HTK: 0
Cost: 26 Crew: 5
Materials Required: 6.5x Duranium 0x Neutronium 19.5x Gallicite
Development Cost for Project: 260RP
Fuel Capacity 10,000 Litres Range 0.9 billion km (18 hours at full power) 13800 km\sec
Power Efficiency -30, Power Increase 15%, Exp 12%
Fuel Efficiency 4, Fuel Usage x0.6
Thermal Reduction: Signature 16% Normal
With this in the old rules I get an 18.58 hour cruise time, a speed of 13,800 km/sec, and a range of 894,240 megaklicks.
If I take the new engine design specs, for a 60 power engine (3x) I have a 15.25 hour cruise time, a speed of 12,000 km/sec, and a range of 658,800 megaklicks.
To compare, a 40 power engine (2x) has a whopping 105.22 hour cruise time a speed of 8,000 km/sec, and a range of 3,030,336 megaklicks.