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Old 03-02-2014, 08:27 PM   #1 (permalink)
Master EcoModder
sarguy01's Avatar
Join Date: Jan 2010
Location: Virginia Beach
Posts: 468

Mazda5 - '12 Mazda 5
90 day: 25.22 mpg (US)

Big D - '11 Dodge Durango Crew
90 day: 18.75 mpg (US)
Thanks: 86
Thanked 87 Times in 54 Posts
Grill Block 2.25% Increase @ 50 mph.

After the air dam failing to gain mileage, I decided to go another route while I ponder the air dam some more.

I went to Home Depot, bought some 7$ flashing and then made a cardboard template. Using the license plate bracket and some leftover aluminum angle, I fabbed up some quick mounting brackets. I also put some angle inside the bottom grill opening to hold the bottom of the flashing in. Once the cardboard template fit, I traced it onto the flashing. I then used some self tapping screws to hold the flashing to the brackets.

Here is the pic I took.

Coolant temp stayed right at 195-200*, which is normal. I'll be sure to watch it as the weather gets warmer.

After ABA testing tonight at 50 mph, I got an increase of 1.7% one way and 2.8% increase the other way. Average gain was 2.2%. That is about 1 mpg at 40 mpg. Hopefully the net gain will be higher the faster the car goes. I am out of time to test until next weekend though.

It will take a few miles (4,000) to pay off, but I'll take the gain! I am going to paint it black when I get a minute so it doesn't stick out as much.

Last edited by sarguy01; 03-03-2014 at 07:51 AM..
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