ive got a 98 ford and i get about 13 miles to the gallon its all stock besides a muffler what can i do to more miles

 

Good maintenance will get you the best miles. Running fine wire iridium plugs may help some. Everything works together including driving habits.

Intakes and mufflers do nothing for mileage. A good/true wheel alignment helps.

I'm on top of maintenance, sensors are updated, ported and polished the intake. I also keep the valves clean (via Motorvac) and run Denso plugs in my 4x4 5.4L. I only average 16 mpg. High miles @ 279,000. So your not that far out. The 4six and 5four get about the same MPG. The 5fours being a little better.

 

well Im guessing you are 4x4 maybe you could run a little bit skinnier of a tire. What tires are you running now? As anyone else will tell you you may have to make some sacrifices to get better mpg. You may not have to get a smaller tire size as far as height but a skinnier tire will help

 

A little more timing at cruise is a good help too. proper air preasure and windows up on the freeway.

 

i have a 2x4 and i just got 20 inch rims not to long ago. my check engin light is on i put new spark plugs in but its still on for emissons and egr.

 

How much more do your 20"s (wheel and tire) weigh more than the setup you took off. How much wider is the tread?

(fix the egr/cel)

I get 10 with 5.4 4x4 with 20"s. Had a few tanks of around 12.5 on the stock 17"s

 

Wow.. you guys are gettin what my 4x4 on 33"s gets lol. Guess i shouldnt complain much now

 

i had 16s the tires are like 275 55 20 i think.but ive been getting the same gas milege as when i had my 16s. my check engin lite is on though

 

Get the codes read and fix the problem before you go complaining about fuel mileage. If something is not working properly it could be contributing to poor fuel mileage eh

 

well one for egr and the other is emissons and that could be numerous things so i dk what to do eh

 

That is a sharp looking truck you have there.

 

Ouch! My 03 4x4 (5.4L auto) with 35s gets 15-17 mpg depending on tire pressure and my 03 2x4 (4.2L 5 spd) with factory wheels/tires gets 18+ with a bad alignment and a 28ft ladder on top. Take it to a shop and at least let them run a diagnostic. The longer you wait the worse it will get.

 

What are the EXACT code numbers?

My son in law has a 98 4x4 with a 4.6 and he's getting about 12 mpg, he has a P0401 code which is *probably* plugged EGR passages in the throttle body. Before he got the CEL, he was getting about 15.

 

Yea definitely get those codes, I'm getting 13mpg city with 35's so whatever's going wrong under there will definitely bring up your mpg once it's fixed.

 

p1409 is the code