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Oct 22, 2015 | 07:17 AM

#371

Fbcoach

Senior Member

Joined: Feb 2014

Posts: 2,239

Likes: 224

From: Chicago area, Il

Quote:

Originally Posted by Bucko

Tonneau's may lower the MPG rather than increase it. Truck engineers got it right by allowing the air flow to circulate back towards the cab after it goes over the roof. The Tonneau cover defeats this; may even drop MPG.

I have one on my truck as well; my Edge instant MPG did not show a drop or increase with it installed though.

Interesting! I didn't know that!

Oct 28, 2015 | 10:38 PM

#372

crash67

Senior Member

Joined: Jun 2013

Posts: 128

Likes: 4

From: Iowa

What do you enter for 285 65 18 tires

Oct 29, 2015 | 12:51 PM

#373

HulluCorn

Senior Member

Joined: Mar 2015

Posts: 253

Likes: 14

Quote:

Originally Posted by crash67

What do you enter for 285 65 18 tires

I came up with 2600.3

Is there any explanation why my speedo would still be off by 4mph

Last edited by HulluCorn; Oct 29, 2015 at 02:01 PM.

Oct 29, 2015 | 12:57 PM

#374

techrep

Senior Member

iTrader: (1)

Joined: Jan 2009

Posts: 37,815

Likes: 2,714

From: Va. Beach, VA.

Quote:

Originally Posted by HulluCorn

I came up with 2600.3

Is there any explanation why my speedo would still be off (

what brand tires ??

Oct 29, 2015 | 02:54 PM

#375

HulluCorn

Senior Member

Joined: Mar 2015

Posts: 253

Likes: 14

Quote:

Originally Posted by techrep

what brand tires ??

"Originally Posted by Summers22 View Post
275/60/20 is 2632mm diameter"

2005 FX4 5.4 3v
275/60/20 is 2632mm diameter
Goodyear Wranglers with 5,000 miles.
Off by 4MPH via GPS