Hi Scotty,
Most of the FICHT problems were associated with the small block 150-175 motors.
In 2002 Bombardier took over the dying OMC business and produced the 3.3 l big blocks with much improved electronics,especially the EMM. They aren't the old Fichts, they were Direct Injection and have big strong internals, closer engine tolerances and not much changed from the current E-Tec's.
Fuel economy should be similar to an E-Tec in the mid to WOT RPM range but will not have the extremely low fuel usage of an E-Tec while trolling in the stratified injection RPM range. Power is also on par with the current E-Tec's, that motor of yours is a real torque monster, they are probably one of the most powerfull production 2 stroke outboards built and as for 4 strokes they aren't worth a mention as you will never see one go past your rig.
Soot / Carbon is the big killer of any 2 stroke engine, this is what got Evinrudes FICHT in trouble early on, the Evinrude engineering team that developed the FICHT though they had engineered a bullet proof powerhead confirmed through 1000's of hours of WOT testing. In the real world many many FICHT outboards are still running today, for people that water ski or run hard offshore to bottom bounce the FICHT was never a problem. What killed these engines was carbon forming in the ring lands during extended hours of trolling at low RPM, then when the engines were opened up and run hard on the way home the pistons and rings would expand with rising engine temperature, the rings would have a layer of carbon behind them and with on where to go would expand and grab the bore, another seized powerhead was the result.
Many 2 strokes over the years have had design problems of this nature over the years, Yamaha had similar problems with their 3 ring design a few years ago.
Most of this was all history when your Evinrude DI outboard was released, but if you want to get the best from her you still need to feed your engine a healthy diet.
If it was my engine I would olny use quality BRP oil designed for FICHT and E-Tec engines, use good quality fresh fuel and de-carbon the powerhead as per Evinrude maintenance procedure.
These are big strong engines, drive it like you stole it, properly maintain it, and enjoy her.
Cheers,
Pete.