i have 2008 2 wheel drive 6.4 super cab. was getting 14 mpg then bought new air dam from ford for bottom bumper that added a total of 4" picked up 2 mpg then taped up bottom bumper and top grill 2 outside openings now getting 21 mpg looking for blank offs for bumper. temp never moved changing gears to 3.55 will post mpg when installed.

 

[quote=mikejbayus; .....changing gears to 3.55 will post mpg when installed.

I am most interested in your plan to go to 3.55 gears. What is your present gear ratio, Ford or Non-Ford gears for the change and estimated cost for the switch?

 

just what did you tape shut????????I also chaged to the new airdam and have seen incresed mpg. Exolain to me what you taped.....I'll try it also.

 

Do you mean that the airdam hangs down from the bumper 4"?
Also interested in your gear change. I read somewhere that when Ford decided to change the gears from 3.73 to 3.55 they expected a 1/2 mile increase in MPG. Let us know what you are changing from and how you do with it.

 

[quote=pilotshot;6131736][quote=megabytes; .....changing gears to 3.55 will post mpg when installed.

I am most interested in your plan to go to 3.55 gears. What is your present gear ratio, Ford or Non-Ford gears for the change and estimated cost for the switch?[/QUOTE]

i have a friend that works at ford axel who is getting 3.55 gears for song & dance and i have 3.73 right now

 

i taped up openings in bumper you have 2 were fog lights are and one in middle & two in grill on sides

 

[quote=pilotshot;6131736][quote=mikejbayus; .....changing gears to 3.55 will post mpg when installed.

I am most interested in your plan to go to 3.55 gears. What is your present gear ratio, Ford or Non-Ford gears for the change and estimated cost for the switch?[/QUOTE]
about $ 300 for gears and $200 for speed wizard for speedometer

 

I ordered the bigger air dam yesterday for my 08 even though I really don't like the looks of it and I was looking at covering up those 3 holes also. I'm willing to try just about anything to get another mile or so per gallon! Here's another thing that I discovered. I bought a Leer topper for mine last week (the 100XL) and my MPG jumped up by 1.0 MPG almost instantly.

 

are you talking about the two holes where the lift hookups stick out? Did you really cover the hole where the air flow goes to the radiator?

 

Could you post some pictures for the air dam and also the taping?

 

We should have the Nascar boys look at our trucks. Bet they could help alot with the aerodynamics. Going down the Highway now is like pushing a 6 x 8' sheet of plywood. That is also why above 60mph the fuel milage also really drops.

 

I think you'd want formula 1 people to look at trucks, Nascars are lucky to hit 6MPG racing :-P

 

yes now i know this works i will make stainless steel plates to cover and you still have about 3sq ft of opening for cooling

 

there is nothing to see i used white tape to cover openings. try it and you will find a increase in mpg and no temp change.

 

Yeah, but if you could get 6 mpg at 180 mph in your truck, you'd be doing pretty good.