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Old 12-29-2009, 03:54 PM   #283 (permalink)
Matt Herring
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Join Date: Jun 2008
Location: North Andover, MA
Posts: 857

Bone's 2010 Prius - '10 Toyota Prius Black
90 day: 56.78 mpg (US)
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Amen to the full upper/lower grill block!

For the past couple months I've been running a full upper/lower foam pipe insulation grill block and in current 20-30 degree temps (and sometimes lower) my engine temps are in the 185-195 degree range after about 6 miles without using my EBH...which are the same temps I see in the summer months without the grill block (but within 3 miles in the warmer temps). Since my commute home is 11 miles the last 3-4 miles of my drive I make up alot of the mpg I lose on the first half of the commute.

Current Stats (average of 3 drives home the last 3 days):
First 7 miles home: 44 mpg
Last 4 miles home: 62 mpg

When using my EBH I'm in the 185-195 degree range after about 5 miles in 20-30 degree weather. It seems once the heat is generated by the ICE it stays in the engine area pretty well with the grill block installed.
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