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It's different circuits though ain't it, so it's effectively running two GPS circuits (maybe). I still say it's the screen that chews the juice.
hippy-
For the amount of DPI and brightness the screens outputs, it has to be. Might try a full power/ no GPS power down test between the 810/1000 at work and see how they fare.
There's also very little info about Garmin internals it seems. Would be interesting to see what chipsets are used.
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It's different circuits though ain't it, so it's effectively running two GPS circuits (maybe).
The biggest extra draw will be that more satellite locks = more processing required in determining the (more accurate) position.
Whilst you need a minimum of 4 satellites for to work out your position (in 3D) any extra satellites will help refine this but add to the burden on the GPS chip, which means more power required. Enabling GLONASS will effectively double the number of satellites available which leads to a noticeable decrease in battery life.
Chak
Greenbank
Don't see why it would. 2 or 25 Satellites, it makes no different to the chipset, which if I remember right, is qualcomm, which locks on to both GPS and GLONASS equally. I'd go as far as saying it will be less power hungry since it's finding satellites easier and thus not pushing power through signal to find more satellites.