I have a 2011 4.0L extended cab sport 5sp with the superchips cortex tuner full K&N cold air kit and full magnaflow exhaust and throttlebody spacer...
mines stock (2wd)I get 35mpg regularly on the highway and about 19mpg in town..
superchip tuner changed nothing....i saw no gains and felt nothing different..all in all the upgrades I have done gave me more bottom end torque maybe 10mpg in the grand scheme of things..deffinatly helped the numbers in town though..but i also spent close to $1700 to acheive this
well, i really don't mean to sound like a dick, but you must have a wizard in your truck, if the tuner did nothing, because the K&N cold air kit will not add power, the stock intake comes in through the fender, and brings cold air in, so the cold air intake you bought will do nothing, the only way a cold air kit would have any benefit on our trucks would be if it takes air from the same place, but keeps more heat out of the intake tube...
the k&n filter will give you better air flow for maybe 2 weeks, before it is dirty and flows worse than a paper filter, throttle body spacers are proven to do nothing, and this is proven time and time again, simply put, for the amount it costs to machine one, every vehicle would have one from the factory, if it did anything... only way a spacer could do anything, is if you've got a/c refrigerant running through it, which actually could provide some serious gains, if done correctly, it would help cool the intake and give you a denser charge, though you would lose what ever gain you make, on the draw of the a/c compressor...
as for your exhaust system, if you changed the exhaust manifolds to headers, you will gain some there for sure, but not 10mpg...
as for the rest of the system, nope...the stock muffler is pretty unrestricted, (i also have a magnaflo muffler now) the stock ranger cat is also high flow... so i hate to be a dick, but the only thing that would have made a difference, would be if you have headers now, if what you say about the chip is true...
actually, thinking about it, i did hear some really interesting facts on HHO generators, basically it's a device that splits water into hydrogen and oxygen, and you take that and re burn it. you can power one from your battery on your vehicle, and it can be self contained, with the exception of refilling the water (distilled water would be ideal) the theory behind this is not that the hho adds power by adding an additional fuel source, because as with the a/c in the intake, the benefit would be lost by the draw to create the gas, but rather the hho burns differently than hc+o2 and the two reactions happening simultaneously is said to make the hc+o2 reaction more efficient...
of course the argument could be made that when hho is burned, it creates pure h20, which of course, is much more dense, and smaller physically, and based off of the principals of a combustion engine, this may work against the power stroke of the engine... the question is, how long does the hho burning raction take? if it is the same time, or slightly longer than gasoline, then we are fine, if it is much shorter, it's going to be shrinking, and actually take up less volume in the power stoke, than it does in the compression stroke... and this, even without the draw of creating the gas, would cause a loss of efficiency...
the last question about HHO working in a vehicle would be what is the "octane" equivalent of it? if it turns out to be the mid to high 80's it would be fine, but if it's say 70 or so, then you're going to have predetonation, and it (i am sure) will burn hotter than the ignition point of fuel, which means your gasoline is now burning too