Bring on the Heat!
I would put my bets on cleaner fuel injectors + warmer weather. I finally got a near 60 degree day here (it's been 40-45 lately) and I was pleasently surprised at the MPG jump I got on the scangauge of about 10% better FE on the freeway.
Enough of my ranting though, keep testing your project out man, and if it comes out well enough I'll switch over to Techron instead of Lucas for my fuel system cleaner when I do my oil changes.
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