[notevenclose]

The tornado does not work to improve fuel economy.

What the tornado and any other throttle body insert(not spacer) does is reduce the size of the intake tube...that's it. Doesn't matter how you pitch the blade or how shiny it is. By doing this, you make the engine more responsive at low rpm because the intake stroke is more efficient. In doing so, the engine is then choked for air at higher rpm and you step harder on the throttle. Think of it this way, if you have a small diameter straw and a large diameter straw and you are drawing fluid thru it, which one takes less effort to start drawing fluid? The small one, right? But you have to really work to get a high volume. The large one takes more effort but when you do get fluid going, you get a larger volume. Toyota's engineers calculate what the optimum intake plenum size is for 381 hp at whatever rpm. Don't waste your money unless you REALLY like shiny things.

Now, throttle body spacers have a similar effect. What you are doing here is lengthening the intake track making the engine work a bit harder at lower rpm because you have increased the intake volume...like increasing the straw length. However, as the engine speed increases, so does the efficiency because now you have a ramming effect of the fuel and air at a higher velocity headed to the combustion chamber. Then, you end up cramming more fuel and air into the combustion chamber and more power. Like a longer straight-a-way on a racetrack or a longer straw from before. These may yield better performance at higher rpm but i doubt it would pay for it's self. You are talking like a half an inch or so of increased length. And you won't get better gas mileage because you'll have your foot in it to get any effect!

Again, this has been calculated by Toyota...and every other engine manufacturer. The iForce even has variable valve timing to compensate for lower rpm so let the engineers do their job. They don't get kickbacks for low mileage engines but they do sell more vehicles if they are efficient.