[Armypilot]

Sounds crazy but I got better mileage using sport mode than tour mode. Tour mode 24.2, sports mode 25.3. I have a 2015 ATS Coupe Premium with a 3.6 with 2500 miles on the car.

I am a conservative driver and the test was taken to and from my destination a distance of 10 miles one way. About 5 stop light along the way.

The steering, handling and ride was much firmer using sport mode. I like the tour mode better.

 

[clempot911]

You got a difference of 1mpg over 10 miles - I think that could be due to a lot of things that have nothing to do with the car: Head/tail wind, slight uphill/downhill, etc. I think it would be more meaningfull if you got those results across several tankfulls.

 

[Maxplot]

I prefer tour mode too. I wish it was even softer for around town. Sport mode keeps the wheels glued to the road better. I get a little wheel hop on a curved bridge at the expansion joints when in tour mode, but sport mode the hop at the expansion joint is gone.

 

[louie1487]

I honestly don't believe one will give better mpg ove4 the other. It's all how driver works the pedal. I've driven a luxury trim and premium over 100 miles each and very similar results. This was on a 2.0 though.

 

[Ragtop 99]

With low miles, mpg measured early may be lower than mpg measured after a longer break in period. Were the measurements recent?

Agree that 10 miles is not enough. 3 tankfuls would be better to eliminate filling variances.

 

[Billm0066]

You don't have enough data to support your find. As others have mentioned there are too many variables to influence those numbers.