I think I'm getting about the same. I'm switching between 91 and 89 octane, every other tank. Do you know how big the tank is? It seems small.bigkite said:Just wondering what kind of gas mileage you guys are getting on the CTS. I have a '04 with the 3.6 auto. 21 mpg on the first tank 50/50 highway/city. The DIC was very close to the calculated mileage.
I averaged 26mpg today driving all over central and northern Indiana. City is around 20, less in sport mode.c5 rv said:I have a bit under 1000 miles on my CTS and I'm getting about 23 mpg overall. I assume it will go up a bit over time. My vette, that gets 25 mpg overall, is still my "economy" car.