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Just thought I should follow up with this. I took 2 logs of my morning commute to work. There was a difference in ambient temp and looking at the IATs there is a difference, but I would not think enough have a noticeable increase. I want to try some back to backs one of these days.
So with the larger filter, I had an average speed of 35.87mph and an average fuel flow of 12.75lb/hour so my calculations came to 17.44mpg with the average intake air temp of 107degrees F.
The smaller filter, I had an average speed of 37.08mph and an average fuel flow of 11.98lb/hr so my calculation came out to 19.19mpg with the average IAT being 94degrees.
The 2 filters were the same brand (K&N) and constructed the same way, just different size. Traffic was roughly the same and hit the same stop lights. No idea why, but thats the numbers I got.
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