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I use the Garmin RV 770 with voice command. Without a dissertation, I use the voice commands to search for gas stations along my route by name: Pilot, Flying J, Loves or, in the case of back roads, just 'gas station'.
The last option is usually when things are getting really tight. If I have to unhitch the towed, so be it. Better then being stuck on the side of the road and having to unhitch the towed anyway to get gas (towed always has a 1/2 tank when traveling).
The only downsides I've found so far are:
1) you can't 'see' the station until your there. Keep your eyes peeled for a good turn-around-spot in case things look too tight.
2) If the cab's noisy, the Garmin has a hell of time properly interpreting your words. I usual save searches for level places or downhill runs when the cab is quietest.
Hope this helps.
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