I'm not. I have mine boosted in the midrange from 20-50%. I can't say it hurt my mileage and I drive a lot of back roads.


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Throttle request tables have less to do with economy and more to do with how you want the throttle to "feel"

 

That has not been my experience. My experience and understanding is that the tables define the requested torque from the engine. If I am requesting much more torque at low throttle input, then I'm going to use more fuel. Maybe it is different on the ST platform, but for the Cruze that is certainly how it is.

This table allows manipulation of the relationship between requested engine torque based upon the current Accelerator Pedal Position dictated by the driver's foot in gears 1-6. This final result is then used to command engine torque by means of the settings in both Load To Torque and Torque To Load tables. Care must be taken to ensure all of these values are smoothly transitioned between cells or undesirable drivability may ensue.

I understand what you mean about feel and I understand why Cobb changes to the linear style, but the values at "part" throttle are much higher than stock and as such are requesting more torque to give a sportier feel.

 

If you request more torque you will accelerate faster. So in the end your foot still determine how much torque is available and the throttle tables should give you a nice resolution and ability to select torque request easily with your foot.

A lot of modern cars trick people into an ECO mode by having an unresponsive pedal so that the user puts up with the lack of response and doesn't push it deeper.

 

This exactly. Changing the throttle tables will change feel and response, but provided you still drive based on how the car actually accelerates, your economy should be similar.

If you set the tables more aggressively, you need less throttle application to get the same torque, and if you don't adjust your pedal habits because of it, your economy will suffer.
If you relax the tables, you can vary your pedal more, but you might lose the "snappy" feel to the car. This also makes it harder to control your power as you'll have to ramp up your high end more, which if you track the car may cause you some hassle trying to put the car directly on edge around a corner. This is probably why the Cobb OTS maps use a linear throttle, as it allows for a more predictable throttle response in these conditions.