Don't waste your time on the Tornado. I have it in my 92 SC400 and did not notice any improvement.

 

What a cool first post! Haha...I have it on my car (got it for free) and it helps out on the mileage a tad.

My other friends, one with a F-250, gets an extra 40 miles to the tank. My other friend with a Camry 4 cylinder gets another 60 miles to the tank.

 

That's nice. I have a heavy foot so the extra 1 mile per gallon was certainlly not as advertised. If I drove like granny on Sundays I might see another 25 miles per tank I guess. It was not worth the time to install it or the 80 bucks. I left it in and still get 300 miles per tank give or take.