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If you accelerate gradual, the truck will accelerate as needed, with the elimination of any excess fuel and smoke that is captured in your filter. We must remember that with emissions control, the computer will not let the fuel system to dump fuel in for fast acceleration, as of 2007.5 and newer with all diesel truck engine manufactures ( with a tune/chip this part of the program is eliminated and allows some excess fuel to be injected to compensate for that fast acceleration off the line), this is why there seems to be a lull on hard acceleration with some trucks, from any manufacture. Some trucks are worse than others with the computer in control.
One way to note if your regen is on, is by the change in exhaust noise when pulling; gives the sound of a huge air compressor discharge, especially on a uphill heavy pull ( open your rear window and note the exhaust noise); and as noted you do loose some horsepower as it goes through its regen process, you may not notice this as when on cruise it just dumps more fuel in to compensate for the horsepower required to the conditions that you are applying to your truck.
Many of the Heavy Duty Highway truck drivers are complaining about poor fuel mileage and the huge horsepower that is required to compensate for acceleration and heavy pulls with the new emission standards. A lot of the new diesel engines will be running with a coolant temp of 225F to meet emissions. This then changes the requirement for a higher qulity of oil, coolant and engine sealing materials.
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