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Thanks for the advice, this all sounds quite true. I don't know how I'd know if the HRM was working properly, it states my average heart rate as 137 with a max of 205. I was going at a bit of a lick but not exactly as if my life depended on it. I can live without knowing the exact numbers, but I'm curious as to what would explain the discrepancy all the same
ghostface
@Greenbank
The faster you go the more calories but the less time you're riding for. It pretty much averages out so the speed is not an important factor, only the distance (and elevation change).
Was the HRM working properly? With an HRM the Garmin will attempt to use that for the bulk of the calorie calculations based on the notion that an individual heartbeat correlates quite well to a specific calorie usage figure.
Cycling is generally 450-750 calories per hour, so 300kcal for the whole thing is woefully inaccurate.