Moose08

Over passed 2 years I've thought I've noticed a decrease in mph but wasn't sure because I only drove my truck on weekends.. well I have been driving it to work for a month now and my mph went from 13 to 8 I've never had a drop that on anything any ideas ?
Truck is 97 4x4 at extend cab

Bill's03F-150

If I had to guess I'd say it's probably the ethanol in the gas. Everybody keeps upping it and it burns so quick. I've tried everything to make my mpg's a little better and nothing works. When I got my truck I was getting 16 out of it and now 4 1/2 yrs later I'm getting 10 to 11 depending on how much I put my foot in it.

Moose08

I thought about that but my friend has a 03 with the 4.6 and gets gas at the same station like i do and his mpg has never changed...Got another friend with same year 5.4 hes going to fill up there and see if he looses anything
Also ive noticed slight power loss, a hill on the highway in this area my truck now has to down shift to maintain 75, it never used too.
Going to do engine flush this weekend, dont think it'll do ***** but we'll see.


forgot to give some info:
Since 2007:
Plugs & 2 COPs have been replaced,
Fuel filter has been replaced
BBk headers have been put on
Have ran the same size and brand of tire
No CEL
Does not burn or smoke oil
has 156k miles
oil+filter+lucas oil and gas additive every 3k miles
New exhaust headers back wiht 02 sensors,cats and muffler
New egr sensos

ksfulcher

Have you done a basic tune up? plugs, coil paks, air filter?

Bill's03F-150

I have a cold air intake, have done the plugs, and just changed all my lower fluids ( tranny pan and filter, front and rear diff and transfer case). I haven't don't the fuel filer or the coil packs. Do you think that one of those things could be why I don't get very good mileage ?

03FX4604

Winter....

Moose08

Ive been told that but i talked with my gf who drove my truck alot this summer and she said it was getting 180 miles b4 the low fuel light came on.... which tends to be 4 gal left....but she thought it was normal

just flushed the engine twice, cleaned the maf,TB,k&n. Going to check fuel pressure and check plugs tom, we'll se what happens

nath1142

Plugs that Are .10 gap smaller and a heat range colder will help with ethanol

Collin

Well since your MPH has went down that means you need to step on the skinny pedal more

Moose08

lol props for you on catching that.. didnt even notice lol