DreadPirateWill

Typically the range is +/- 5% of nominal for the utility at the meter base - so at the mains you should have 114-126V. This can change...

*Typically* the run from the transformer to meter panel is owned by the power company. That, and what you've got beyond all sounds...

What are you wanting to run on this circuit? Typically voltage drop isn't a major factor for house wiring - run the appropriate gauge...