Many of you may have recently received a mailer from United titled “Reveal your mystery bonus of up to 75%, 80% or 85% more miles” for purchases of miles until December 14, 2015.
I checked my offer, and it was for 85% bonus miles. After taxes and fees, that brought the cost to 2.03 cents per mile, which was a price I was okay with, but ultimately passed on.
However, a data point from one of my friends, Josh, as well as FlyerTalk shows that the bonus actual goes up to 100% bonus miles.