The phrase "same mpg" refers to having the same miles per gallon. It means that two or more things, like cars or appliances, can travel the same distance using the same amount of fuel. Full definition
I didn't like how the Prius looked, so when I saw that Honda came out with a Hybrid version of the Accord that got the exact same mpg as the Prius, I was hooked! (autolist.com)
Although lighter, the crossover will return the same mpg rating. (suvtrend.com)
# 28, I'm surprised the C - Max and Fusion hybrid would get the same mpg ratings. (autoline.tv)