Black smoke is unburned fuel. It's not possible to increase the amount of smoke coming out of the exhaust AND increase fuel mileage.
The power gain stops as soon as you stop being able to burn all the fuel that is going in, unless you are just using the fuel as a filler for increasing compression which is extremely inefficient(retarded).
IOW, the black smoke pouring, badly tuned, trucks with stacks are a way to compensate for a small dick by wanna be country boys who know jack shit about a Diesel engine.
A well tuned diesel will get max power with minimal smoke and beat the shit out of the cracked out smoke machines.
My shop truck is a Dodge Ram 3500. That thing can haul anything I can fit on the trailer (you shoulda seen the size of this skid-steer today!) with no power issues. I haven't ever seen that thing even hiccup a puff of smoke.
I've posted this before, but now seems a good time to revisit.
I had a lifted 4WD PSD that didn't smoke too bad, but it did push a lot of stinky exhaust.
The wife and I went to dinner and on the way back, caught a red light. I was in the left lane.
A lowered Explorer pulls next to me in the right lane, windows down, bass thumping annoyingly loud with two backwards hat wearing idiots bobbing heads.
I eased up till the exhaust was aligned with the driver's window and spooled that bitch up.
They were caught in traffic ... couldn't move. It was pure comedy watching those two trying to get away.
So you blew the exhaust in their window while driving because you didn't like their music or car taste? So you could have caused an accident because for one moment, you wanted to be a d-bag too....good for you
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The first sign of a liberal is thinking someone else should do what you think is right. Sorry if your Prius got a little stinky....