Quote:

I got better mileage on the street just from adding a turbo on my 2000 4.7 Dakota.

But I will be the first to admit it is because I drove it different. The turbo would spool up and come on like a light switch with any more than 1/4 throttle applied... so I pretty much drove it at 1/4 or less unless I was going WOT. Without the turbo, I would catch myself leaning into the throttle at 1/2 or 3/4 all the time - which is where my mileage went. I don't doubt that the turbo aided efficiency even when it wasn't at WOT - but I could buy a whole bunch of fuel for what the system costs.



Since the engine is not under boost at cruise the turbo has no ability to improve mpg, however the factory programming is terrible for MPG and since your computer was reprogrammed that alone is where your mpg improvement probably came from.

I am not causing global warming, I am just trying to hold off a impending Ice Age!