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"Went better" doesn't mean better mpg, if anything it means the exact opposite. If you are driving for economy you would never notice when a car is really making power because you would be running around at 3/4 throttle or less, shifting early in the rpm range, etc. If anything you want to make the motor make less power so it requires more throttle opening which reduces pumping losses. A big EGR or warm air intake helps with that. Again both of those things can make the car run what would feel like worse to you but it would be getting better MPG and still move along in normal traffic just fine. My van has an "economy" button with a little green light, the magazine testers hate the switch because it makes the van run like a dog, less throttle response, earlier shift points, etc. but it definitely helps with the MPG keeping it on.
I don't believe a leaner burn mixture is ever activated in any modern car because of NOx standards of today, at least in the USA. Volkswagen was basically doing this with their diesel scandal.
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