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@Smallfurry
I only have a PowerCal. Which is yet another guesstimate method.
Since resetting my FTP I've done 2 workouts where the IF has come out over 1 for an hours work out. So I'm suspicous that I've done a poor test. I accidently started the 20min test, right in the middle of the test period, when setting the laptop up. Which made a big dip in the power, and HR curves, when I did the test properly. Not sure of the effect of this. Calculations from hill repeats give me a FTP of 275 watts, and my TrainerRoad 20min test gave me 235 watts. My gut says 250 watts.
The TrainerRoad power curves match the CycleOps curves really well. At least in the important regions. But how accurate the CycleOps curves are is another question. Which setting are you using?
I plan to save data rom the road, separatly to turbo data. So I wont be comparing them directly. Its probably a good idea to separate indoor and outdoor efforts anyway I guess. Absolute values are'nt really of importance to me. So long I can gauge improvement areas.
At the end of the day TrainerRoad gives the power your rear tyre patch puts on the turbo. A power meter gives the power your legs put out. I watch the flywheel put out 100 watts after I've climbed off the bike ;)