I got what I considered to be excellent gas mileage out of my 99 reg cab, XLT shortbox 4X4 this past weekend. Filled up before I left town, drove to my buddy's place and stopped at a "quick mart" a block away to top off. I put 67 miles on and used 2.74 gallons. That's 24.4 MPG!

After my buddy and I did all the caluculations, we couldn't belive it. So I did it all again on the way home that evening, and same thing, 24 MPG.

Had cruise set at 65 on highway. Only mod I did to the truck (if you want to call it that) is put in a K&N air filter.

Anyone else getting anything like this???????

 

nope...and have K&N

 

Not even close. I normally get 15 around town and on the highway.

What axle ratio do you have? Tires? Auto or 5 speed?

 

Sorry it's took me forever to post a reply.

Axle ratio, not sure but I will look. The tires are 235/70/R16. And the truck is auto. I'm still amazed. Of course it's not anywhere near as good around town.

 

97 F-150 Scab 4.2 Manual 5 Speed Trans.Iam Getting 22 Highway,17 City.Pretty Good For The 4.2L!!

 

Thank God someone else is getting good mileage, I thought I was losing it...

 

I have a 4.2L, 5spd, 2000 ,4X2 ,Scab Sbed twice a month I drive 360 miles straight and got 17.5 to 18 mpg. driving at about 75 mph avg. Hwy., some times faster. I took the tailgate off and replaced it with a net, and now get 19 to 20 mpg. I think Iam going to try the K&N filter.

 

My old '97 4.2 (before Superchip) would get 23 on the highway. This was with 3.08 gears and 5-speed. If you're getting the same mileage around town as you do on the highway, I would say you're calculating your mileage wrong.

 

Who do you think is calculating their mileage wrong? Looks like what's happening is you are misreading the posts. Everyone who has responded to my original post has been very clear when talking about highway or city mileage. I think I was too.

Now I took another trip out of town today and the mileage was not as good today, but I had 2 mountains to climb. Big difference!!

 

Read "crashz" post.

"Not even close. I normally get 15 around town and on the highway"

 

Nope, have K&N, but think the 18x9.5 rims and large Falken rubber are stealing fuel from me. Get about 15 around town...

 

I hate to burst your bubble but it is highly unlikely that that is a real figure. The margin of error for that short a trip on your calculation is huge. You really need several back-to-back full tanks to get any kind of a reasonable reading. Just change your fuel by a few tenths of a gallon and see what the difference is. There is too much variation on fill levels.

Not flaming you dude. My truck averages about 19.5 on the highway (for the whole summer) but my variation on FULL tanks can be as much as 1.5 mpg on essentially the same driving and weather etc. The bulk of that variation is in fill level. It depends on the pump, the elevation angle of your truck (front to back), how many times it "clicks off", etc. I know if the nose of my truck is down and I keep forcing in fuel after the initial click, I can get as much as 2 more gallons in the truck. Then my next tank has fantastic fuel mileage but of course it's not real.

 

No offense taken. Read this post Friday but didn't have time to respond until now. I put a longer trip on the truck, 118 miles, and did the same procedure as the shorter trip. Calculated 23 MPG this time. But I understand what you mean by variance according to a few tenths of a gallon and pump variances.

I'll just go by what I look down and see on the guage and smile.

 

cool beans man! I think I could bust 20 if I drove 65 mph. road speed on a 4x4 means a lot because it's like pushing a brick through the air. when you think about it, 20+ mpg in a full size 4x4 is incredibly good. i've also noticed that outside temperature has a big effect. the warmer it is, the better the gas mileage. another factor is the oxygenated gas that is required as winter approaches; good for an immediate reduction of 2 mpg. in the city, the big factor is momentum, do whatever you can not to have to stop the truck. It takes a lot of fuel to get it up to speed again. coasting up to a red light and waiting for it to turn green before you get there saves a bunch of fuel. since full size trucks aren't exactly performance vehicles, i get my jollies by playing games to maximize fuel mileage (without getting everyone behind me pissed off!!)

 

I hear ya on that. Mileage is horrid around town, but that's a given. I'm happy with what I am getting. Wish I could get it to and fom work..lol.