$1 off Gas Purchase of $20 or More at Murphy Gas Stations This post may contain affiliate links. Please see the full disclosure policy here. Posted on November 23, 2010 Written by Mary Leave a Comment Traveling this holiday? Even if you’re not, I think everyone can use a gas coupon! Murphy Gas is offering $1 off a $20 or more gas purchase! Head over HERE and log in-or sign up for their email newsletter to print yours!