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Originally Posted by chadley
Im about 1/2 way thru a tank on my 07 and currently averaging 15.4mpg.(yes its a H2) Ofcourse that is driving like an old lady with a painful blister on her right foot!
I also live in the mountains at about 7500 feet, would high altitude give you better mpg?
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The thinner the air, the less milage I would think.
My catback system has been on for a few months now. I went from 11.7 to 13.2.
After reading replies from this post, I am going to remove the screen from the air filter and hopefully jump up another 1 mpg.
At 14.2 I will be a little happier and if I would quit driving 70+ on the freeway, I could even go slightly higher.