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When you use EOC, I don't think grill block is an issue even at 80F. You are using the engine only at about .25 duty cycle. The thermal inertia of the engine block will be enough to guarantee temperatures don't overshoot. (half the justification for the grill block is lost though)
Your use is not on flat land, so maybe it differs slightly there (going uphill part).
BTW you are very close to my typical use - 3 miles per leg, ~ 10 miles /day, except weekends.
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