Bad millage on 4.0 - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #26  
Old 11-22-2007
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I've never checked my mileage but it seems to do well, or atleast average. Here's a few things to check. Keep in mind with cooler temps if you have your heat or defrost on that will run the a/c compressor which uses more gas. Also jack up each wheel and put the truck in neutral to make sure the tire spins free, dragging brakes can cause bad mileage. Often overlooked is the thermostat. If your engine is not running at normal operating temp the computer will feed more gas. Other than that an o2 sensor could cause it.
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  #27  
Old 11-22-2007
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I get 16 around town and I just drove to Southcarolina yesterday and I got 21mpg highway. Thats because I have 33's and 3.27's lol.
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  #28  
Old 11-23-2007
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i have been getting a constant MPG of 14 average and once it gets colder i know it will keep droping like every year it does 4x4 on i got 6mpg with below 0teps lol thats bad especail with the high gas i just payed 2.91per gal this morning
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  #29  
Old 11-23-2007
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yea i ran seafoam through the motor...i think im going to go to my brothers shop and hook up the scaner and see if anything pulls up on it...
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  #30  
Old 11-24-2007
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Just checked mine today got 20mpg. I think it's a fluke I'll check it again on next fill up. I hope it's not a fluke though since gas is $3.07 here.
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  #31  
Old 11-24-2007
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I have a K&N fipk, Flowmaster 50 series and a performance tune to run 91 octane. and in the winter I get 15-16mpg. in the summer i can get 17.5 over all and 19 mpg on the highway using cc. when it is really cold i get 14.5 mpg. The '08 with the new epa standards are rated for 14 and 17.
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  #32  
Old 11-29-2007
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Check the cat and clean the fuel injectors maybe (I'm not sure if that STP stuff really works), and a big one would be the air filter.
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  #33  
Old 11-29-2007
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My last two tanks were 18.89 using speedway 92 and 19.23 using sunoco 93 (50/50 driving. mods listed on my WEB PAGE )

Rich
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  #34  
Old 12-02-2007
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I've only owned my '98 since May, it had 58k on it when I bought it, it has 62k on it now. When I first got it, I was getting about 15mpg. Now I'm down to almost less than 12. I've been averaging about 12.2. Yesterday I filled up, my gauge said I had half a tank, and my trip only said 88 miles. I was not thrilled. But I think my sending unit has some issues. I have a 4.0L supercab so I should have a 20gal tank, but I only put in 7 gallons and it read half. I should have used at least 10 gallons before reading half.
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  #35  
Old 12-02-2007
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what are mixing with the gas in the pumps cause its freakin freezin in utah
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  #36  
Old 12-04-2007
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I get 16 with a K&N intake and a Dynomax Super turbo exhaust....
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  #37  
Old 12-19-2007
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i get 12 and i have aftermarket exhaust and a k&n box filter with the airbox mod. so idk whats up with that, the truck needs new plugs though hopefully that will help/
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  #38  
Old 12-19-2007
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Just a word to the wise...

If your concerned about mileage. There are two very basic things that will make a significant effect.

1) Driving technique. "If your on the brakes your wasting gas" is a very good rule of thumb.

2) Over inflate the tires slightly. I run mine at 3psi over what the side wall calls for and rotate them every 10k miles w/o wear problems.


btw, Were now into some very cold temps here in Mich (teens/20s) and running winter fuel blend with a lower VP. Between those items and me letting the truck warm up for a few minutes, I'm now down to the 17.5-18.0mpg range for 50/50 daily driving.

Rich
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  #39  
Old 12-21-2007
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Wow. After reading this im getting the worst possible. i get an average of 11 to 12 mpg with a stock truck except 31.5 tires now. Im excited when i hit 250 to a tank of gas...and that was in the summer as well. I did just change the T-stat out so hope that helps. It was stuck open
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  #40  
Old 12-21-2007
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I usually get 22 or right at it in city driving with only an air box mod, k&n filter, and a flowmaster.
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  #41  
Old 12-21-2007
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A stuck open stat *will indeed* cause the motor to run rich.

Rich say you see bettar mileage in fuutcha
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  #42  
Old 12-26-2007
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CHECK THIS!!!!!!!!!!!!!!

About 3 months ago someone got under my truck and cut my feeder gas line going into the tank that I fill up into. They sucked all the gas out (which was about 3/4 of a tank) and left me pissed. I didnt even notice right away, LOL. I was looking at my gas gap thinking didnt I fill up the tank just 2 days before? Went down to the station and gas went all over the place when I tried to fill up. I looked under the wheel well but didnt see it was cut clean the first time. I went to ford and they want over $200, because they sell the whole assemble not just the rubber gas line hose. The problem is it has a special bend to it. I bought gas rated hose the same dimension and it works but it had to bend so bad I cant fill up fast at all. Takes me awhile and I have to hold the gas pump handle the entire time going slow. I used a few extra hose clamps and when I fill up it does not leak at all. I was wondering if even I dont see any leak if possibly I'm venting gas out?

But this thread makes me think no. I bought the 2004 Ranger 4.0 4x4 in March and all summer I was getting 16city 20hwy and now its like 12 and 15. I've been paniced but perhaps its the cold? The winter gas? I didnt think of it? I figured cold is better because it gets so hot in Vegas. my 1980 mustang would just keep running for up to 30 seconds in the summer unless I ran 91. LOL.

So my gas mileage might be normal? OUCH! I took it in thinking a brake was sticking or something.

I need to go to a junkyard and look for a hose but i had to cut mine off so I hope I can get a used one off and save it?
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  #43  
Old 12-26-2007
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I get roughly about 230ish out of a full tank. And thats if i don't go wheelin or go in 4 wheel drive.
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  #44  
Old 02-02-2008
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I get 14-15 mostly mid city/country driving,, not hard either.... I would get 17 on the highway but winter sucks and I get 15 now on highway.... I think Im gonna get a efan for the summer and a k/n and catback
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  #45  
Old 02-03-2008
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I used to get about 12 city, 15 highway. Then I changed habits. I've found if you go over 65 on the highway, you can kiss your mpg goodbye. I drive on a 55 stretch to and from school and when I stay at 55 I get 20-22 mpg. I also changed how I brake. When coming up on a light, don't accelerate to it, just coast. Sometimes you get lucky too and you don't need to fully stop before getting there.

I know for a fact that none of the mods have given me more than a 1-2 mpg gain. Because when I do run at over 70mph and set the cruise, I'll be around 14-15 mpg. When I drive in the winter city with 4 wheel drive, I will get about 10 mpg. Nothing you can really do about it. I don't know any truck that gets more than 10's city driving with four wheel on here.

In conclusion, possibly try driving slower?

My truck 2001 supercab 4x4 4.0.
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  #46  
Old 02-03-2008
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Before winter, I was getting 14.5MPG, now I have no idea what I'm getting, and don't really care much either. Winter I know I take a hit on gas mileage, so I'll care a little more when spring hits.... however, we have trucks so if your looking for gas mileage, a Civic is the way to go!
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  #47  
Old 02-04-2008
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I've had mine for about a year & a half and it used to get a constant 15/20 (city/highway) and is down to less than 13 regardless. It doesn't matter if its warm, cold out or what. No one can give me an explanation. I've swapped everything but the O2's & MAF. O2's will be changed when it warms up. Idles rougher than hell too.

Last edited by sams dad; 02-04-2008 at 12:01 PM.
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  #48  
Old 02-04-2008
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Quote:
Originally Posted by wvcat View Post
I've never checked my mileage but it seems to do well, or atleast average. Here's a few things to check. Keep in mind with cooler temps if you have your heat or defrost on that will run the a/c compressor which uses more gas. Also jack up each wheel and put the truck in neutral to make sure the tire spins free, dragging brakes can cause bad mileage. Often overlooked is the thermostat. If your engine is not running at normal operating temp the computer will feed more gas. Other than that an o2 sensor could cause it.

so my truck never goes over the n on the temp gauge should i get a new stat? and i just got 13 mgh.
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  #49  
Old 02-04-2008
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Quote:
Originally Posted by wvcat View Post
I've never checked my mileage but it seems to do well, or atleast average. Here's a few things to check. Keep in mind with cooler temps if you have your heat or defrost on that will run the a/c compressor which uses more gas. Also jack up each wheel and put the truck in neutral to make sure the tire spins free, dragging brakes can cause bad mileage. Often overlooked is the thermostat. If your engine is not running at normal operating temp the computer will feed more gas. Other than that an o2 sensor could cause it.

so my truck never goes over the n on the temp gauge should i get a new stat? and i just got 13 mgp.
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  #50  
Old 02-04-2008
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whoops lol
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