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Gorgeous van, and your 2002 Si was on my short list at one point in my life.
Careful with the grille block, I'd hold off on blocking it too aggressively until you have an OBDII reader. Many cluster temperature gauges don't even start to move until the engine is close to dangerously hot.
Honestly, the #1 mod to improve economy in your Si would probably be to regear it, though that's really ambitious. If it were mine, I'd probably look into a slightly taller final drive, and a significantly taller 5th, but keep the others as they are so it stays fun to drive. If I'm not mistaken, you're spinning just under 3000rpm at 60mph in 5th, when you would still have power to spare at 2000rpm. I could see that being worth a flat 5-8mpg when cruising.
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