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I just filled up again. I got a solid 1.5 mpg increase over the last tank. It has arguably been a bit colder out, but the WAI and upper grill block combo seem to be doing their job very well. I've always been a bit of a skeptic over WAIs. I understand less dense air increases engine load, and that should decrease BSFC. But, I really haven't seen it work this well on a car before. I guess I always figured the hot air retarded timing enough to negate the benefits somewhat. That may be true on some cars, but apparently not on this one. I think it loves the WAI.
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