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I reckon you may be right.
The eTrex 20* use both GPS and GLONASS, it last a lots longer because of the battery (2x AA), I managed nearly 2 days out of it before the battery fully depleted and that include leaving it on at low brightness all night, if I use rechargeable battery on the eTrex, it might last as long as says the 810.
*screen resolution is very similar to 810 apart from the lack of touchscreen.
edscoble
pjay
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.