I have a 2005 F-150 FX4 see pic below in sig for truck and details, just wondering if this was about right for the 0-60 and the MPG not really worried how fast it is, because thats now what i bought it for, but was just wondering...? and my edge was reading 14-15 MPG and now dropped to 10-12 MPG with the 35" Nittos

 

What did you think?
Bigger tires=Better mileage

Now you need to think about regearing and you might get some of your mpgs back.....maybe?

 

No, I knew that I would lose some mpg, but I thought I would be getting 16-17 stock and now getting 14-15, but these 5.4s don't get as good of mileage as I thought... But o well I love my truck, except the power is a little on the weak side.

 

88 is absolutely correct. 35s, cooler temps, and winter blend gas will hurt your MPG.

It may not be as bad as you think though. Did you enter the corrected (new) tire size in the Edge? If so, have you confirmed your odometer or speedometer with a GPS or Google maps?

One last suggestion, DO NOT USE THE LIE-O-METER (truck or Edge). Hand calculate after each tank and keep a running average.

 

Yup, Calculate your MPG by hand. Fill the tank up till it is full, see fuel in filler neck, reset odometer, drive then fill it again. Divide mileage driven by gallons for accurate MPG.

 

Yea I did that on my last tank and got right at 14, just like my programmer, so it must be pretty accurate.

 

Neither calculation is correct unless you have used the programmer to correct for your tire size and gear ratio. If you haven't, your odometer will be off.

 

I've found that the stated Ave MPG on my old Gryphon/Edge was sometimes almost right on, other times it was somewhat "optimistic". I think the Inst MPG PID is much more informative, although I don't really know that I can maximize economy much. I find I really drive my truck the way I need to, to get where I want to go, in the manner I want, to get there the way I want to. (That's pretty hard to follow, isn't it?)

Things like wind, speed, and uphill/downhill have a profound effect on your gas mileage. It really needs to be averaged over several tankfuls.

- Jack