New Braunfels, TX Lowest Regular Gas Prices Summary. There are 37 Regular gas price reports in the past 5 days in New Braunfels, TX. The average Regular gas price in New Braunfels, TX is $2.17, which is $0.24 lower than U.S. national average Regular gas price $2.41. The lowest Regular gas price is $2.09 of CITGO located at 901 SH-46, New Braunfels, TX 78130.