Spark's calorie calculator assumes that calorie burn is proportionate to body weight. This holds true for many forms of exercise (eg. running, walking, aerobics), but for things like a recumbent bike, you are working against the resistance of the machine, rather than your bodyweight. This can lead Spark to overestimate the calorie burn for stationary cycling, especially for heavier people.
If you were using a low resistance setting, 300 sounds more reasonable. 800 calories is about the limit of what a very fit person working extremely hard may be able to burn in 1 hour - figures above this range should be regarded with great suspicion. 300-600 cal/hour is more realistic for most people.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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