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View Poll Results: Did your grill block improve your mpg.
I noticed an improvement that could only be the grill block 30 65.22%
I noticed no change. 6 13.04%
I saw my mpg drop after I did a grill block. 1 2.17%
I did to many other mods to give the grill block credit. 9 19.57%
Voters: 46. You may not vote on this poll

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Old 08-03-2017, 10:44 AM   #31 (permalink)
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So, is me building a grille block a stupi idea?

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Old 08-03-2017, 10:57 AM   #32 (permalink)
Join Date: Mar 2017
Location: Wisconsin
Posts: 128

BlueBawls - '14 Chevrolet Cruze Eco
90 day: 40.17 mpg (US)

Eddie - '02 Ford Explorer Eddie Bauer
90 day: 26.32 mpg (US)
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Originally Posted by teoman View Post
So, is me building a grille block a stupi idea?
Not a stupid idea. Upper grille blocks from my following of others experiences along with my own seem to be more effective. If your in a cooler climate it's a great idea. It will reduce warm up time immensely. Also really depends on your vehicles. Time of year may also dictate whether u can use it as well if your in warmer climate. Always make it easily removable and have a way of watching your temps other than the dummy guage on the dash. Right now where I live temps are in the 70s by 10 am typically. Been in the 90s and I have had no issues with my grill block. That in itself is due to the fact I only did a partial block. Will do more in winter months. Anyways vehicles are developed to be able to keep themselves cool in the worst case scenario. Like driving up a 20 grade in death valley pulling a trailer. Maybe a bit excessive but you get the idea. If your driving ecomodder style you should be able to get away with at least a partial in any climate.
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Old 08-03-2017, 11:30 AM   #33 (permalink)
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Winter Sacrifice - '96 Subaru Outback
90 day: 23.11 mpg (US)
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Originally Posted by redpoint5 View Post
I noticed the grill block reduced warm up times, but didn't notice an improvement in MPG. Too many other variables at play that any improvement would be lost in the noise.
Same here. It *might* be helping, especially in the winter, but so much else has changed since I started getting serious about MPG.

I took all of my grille blocks off a few weeks ago because it wasn't taking long to reach operating temp and trip the radiator fan at 90-100F ambient. Back to focusing on driving techniques to eke out gains until it gets cold again...

Best tank (so far): 32 MPG
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Old 08-03-2017, 11:30 AM   #34 (permalink)
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'91 Miata - '91 Mazda Miata
90 day: 27.11 mpg (US)

'86 Fiero GT - '86 Pontiac Fiero GT

Purple Penny Pincher - '95 Pontiac Firefly Base
90 day: 43.68 mpg (US)

Jett-Black - '01 Volkswagen Jetta
90 day: 39.32 mpg (US)

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 32.24 mpg (US)
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Welp, my grill block (lower -- there's only a small slot below the hood left for air flow) didn't cause me any issues yesterday, when it was 90-something degrees. Temp gauge never moved above it's usual half way mark. Nor did it on a highway climb up the mountain to get out of this town a couple of weeks ago. This is on my Firefly.

The cooling fan comes on when you stop moving. And it certainly aids warm up time the rest of the year!


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