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Not sure if that is what you have, if you have the 405cx, make sure that if it uses the max heart rate and resting heart rate those are accurate.
I use a suunto that also uses the firstbeat formulas and it seems good. However not that the calories burned includes your basal metabolic rate.
So for example if your basal rate is 100 calories per hour, then the calories burned will include 300 calories of normal metabolic rate.
The number still seems way high, 1,000 calories per hour while riding is pretty darn hard though not impossible. That's averaging something like 250 watts for the entire 3 hours.
The cal. from the garmin devices are way off. I have the 705 and it always gives values that are way too high (and are NOT related at all to power output).
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Considering that Torbjorn set a Kona bike split record on 280W for a bit over 4hrs.; 250 for three hours would be pretty good (esp. at 131 HR). The 190 average might even be a bit high (I don't know how fast you are) given the climbing (and thus the freewheeling on the descents).
HR-based calculators are highly inaccurate for calorie count. Powermeters are much closer. If you have a bike with power (or even an indoor bike with calories/watts) you can get a general feel for how many Kcal/hr. you burn at given perceived effort levels. Note that you will burn ~30% more calories on an indoor bike/hr. due to the lack of stops/coasting (per Chris Carmichael).
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