For those that have directly compared, how does battery life (in general, not evo specific) compare when using google nav and sprint nav. I usually use google maps to navigate (no turn by turn though) and it got me all the way to atlanta on my TP no problem (about 5 hours) but in using sprint nav, I completely drained it on a 1 hour drive to the beach. Will turn by turn on google nav have a similar super draining effect, or is that a telenav specific issue I noticed? I think the source of my problem was that google maps let the screen go off while I was cruising I-75, but sprint nav kept it on the whole time, recalculating and talking gibberish the whole way.