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My current grill block is just for heat retention, but I'm planning on making a more aero one over the winter. The grill block has definitely helped me keep the engine warmer when DFCO, and helps it warm up quicker. Without the SGII, I wouldn't have a clue whether it was working, good, bad or indifferent. My factory gauge doesn't look any different between about 168F and 213F, shown on the SG. Too me, that's critical information. Below 177F and my computer is still bumping up the idle to warm up the engine and if I was running any hotter on the high end, I'd probably cut back on my grill block (probably will have to in the summer).
In any case, the SGII is important for a lot of other things, including adjusting the nut behind the wheel. I'm always fascinated at how good a tool it is to teach you how to drive more efficiently. Just learning where you need to drive relative to other cars and trucks to enter their disrupted airflow and gain 3-5mpg while still maintaining reasonable following distance is vital information to have. I've had mine about two months and it has almost paid for itself in saved fuel costs.
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