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If your fans are kicking on, then don't grill block.
I've run a partial grill block in the summer, but I monitor temperature and have an alarm set near where the fan activation temperature is.
If you use AC, then I wouldn't bother grill blocking. Better to get good AC efficiency.
Slow acceleration doesn't really save much fuel. Engines are efficient at higher loads. Avoiding brake use is much more important.
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