If you’re planning to pack up your car for a road trip this Thanksgiving, you might want to add Denver’s most recent drop in gas prices to your list of things to be grateful for. Over the past month, gas prices in Colorado have dropped 55 cents per gallon — 14 cents over the last week alone — for an average of $3.10 per gallon, according to data from GasBuddy. In the Denver metro area, prices at the pump have fallen 15 cents in the last week, 61 cents since Oct.