The price of gas at the pump went up about 3 cents per gallon on average last week – up more than a dime in the past month in Colorado. GasBuddy.com reports the average is about $2.25 a gallon. That’s lower than a year ago, and more than a dollar cheaper than in 2014. An analyst for the website predicts prices will remain under $3 a gallon in Colorado for the summer. Colorado’s prices continue to be lower than the national average.