I wouldn't make too much of it unless you can actually quantify it.
Are you saying you're warm up happens more slowly, or that you're final operating temp is lower? A grille block can potentially slow warm up a little because the engine doesn't have to work as hard. That being said, I would think the effect would be really small.
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Diesel Dave
My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".
1 Year Avg (Every Mile Traveled) = 47.8 mpg
BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html
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