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  #1  
Old 10-03-2010, 07:04 PM
jord098 jord098 is offline
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Default 99 2.5 terrible gas mileage

ok so to start off i have always had v8 mustangs but i started collage and needed somethin cheeper to drive because i was going to have to start driving 100 miles round trip to get to school everyday so i sold my 95 mustang gt and got a 99 ford ranger reg cab shortbed 2.5 auto and i noticed i was getting what i thought was terrible gas mileage roughly 300 miles to a tank at best almost all interstate driving at 75 to 80 mph so i did a complete tune up changed the oil with 5w20 bought the stock iridium plugs new wires cleaned maf and throttle body changed air and fuel filter and now im getting about 280 miles to a tank its rediculous i couldve kept my mustang it at least got 325 miles to a tank but then ive noticed that cruising down the interstate at 65 to 70 mph its pushing 3,000 rpms and the more you push the gas pedal the higher the rpms climb it never shifts again so i was thinking maybe the overdrive is not working so i hit the o/d off button and at 65 to 70 mph it jumps to almost 4,000 rpms so the overdrive is working and the guy i got it from said he just had the transmission rebuilt so my questions are is this normal gas mileage for you guys with a 2.5 auto and is that normal transmission operation
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Old 10-03-2010, 07:14 PM
jord098 jord098 is offline
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Default Re: 99 2.5 terrible gas mileage

i would also like to add that it seems to idle high around 1,000 in drive and a little above 1,000 in park and the check engine light is on for system to lean if this means anything
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Old 10-04-2010, 12:13 AM
BenGone BenGone is offline
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Default Re: 99 2.5 terrible gas mileage

300 per tank sounds about right. Fill it up, reset your trip-odometer, drive it to about half a tank, fill it up again, then divided the miles on the odo by the number of gallons you put in...this will give you your actual mpg. It should be between 21 to 24. About the best I've gotten in mine is 28 on an interstate only trip and I kept it around 65 and 70 because optimal gas mileage occurs at 55 mph.

Also, tires can affect mileage. Mine has 70's, but if you run anything wider, you're sacrificing mileage. Check the air pressure too...should be around 29 to 30. Mine has 14's, but my other '98 had 15's. They both get around the same mileage and both have the 2.5. If you're tires are over 35, let some air out.

A Ranger isn't built to be a gas saving machine. But it is built for people who frequently use trucks, but don't need a full size. Also, they're about the most dependable vehicles ever built. When I lived in Dallas, I loved it because it was small and quick, yet is still a truck. A common misconception is that they get great gas mileage. They really don't get much better than an F-150, even with a v-8.

In 12 years and 350,000 between the 2, my Rangers left me on the side of the road twice. Once for an alternator, and once for a timing belt...both my fault for not keeping up proper maintenance. Sounds like you probably should have kept the Mustang.

(Both of mine are manual trans, which generally get better mpg than an auto)
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Last edited by BenGone; 10-04-2010 at 12:16 AM.
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Old 10-04-2010, 08:13 PM
jord098 jord098 is offline
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Default Re: 99 2.5 terrible gas mileage

thanks ben i appreciate your input i llove the truck and this forum theres so much stuff you can do them thats not too hard on the wallet
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Old 10-07-2010, 10:22 PM
SpeedNinja SpeedNinja is offline
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Default Re: 99 2.5 terrible gas mileage

I've got a 2.5L, but manual trans. I easily get over 400 miles per tank. I did get less mileage pushing 75-80mph on a couple trips. The 4.10 gearing doesn't like those speeds.
Idling at 1,000 seems pretty high to me. Not sure what to check there. Maybe the IAC.
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  #6  
Old 10-08-2010, 04:36 AM
modelageek modelageek is offline
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Default Re: 99 2.5 terrible gas mileage

PLEASE EVERYONE STOP TALKING ABOUT YOUR GAS MILEAGE "BY TANK-FULLS". FIGURE OUT YOUR "MILES PER GALLON" THEN WE CAN DISCUSS THAT. The reb cab shortbed like my truck have a smaller tank then the others. I have my truck tuned up and the best i get is 27 on the highway. In the winter i get 22ish( I do have it idling a lot). some potsmoker on anther site is claiming he gets 34 mpg in his supercab........
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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Old 10-08-2010, 04:39 AM
modelageek modelageek is offline
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Default Re: 99 2.5 terrible gas mileage

Quote:
Originally Posted by jord098 View Post
i would also like to add that it seems to idle high around 1,000 in drive and a little above 1,000 in park and the check engine light is on for system to lean if this means anything
have you rebooted the ecu since doing the tuneup. have you cleared the codes and the p0171 came back. You probably have either a vacuum leak or a fuel pressure issue. if you can do a fuel pressure test and look around for a cracked vacuum line.....
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #8  
Old 10-09-2010, 07:38 PM
jord098 jord098 is offline
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Default Re: 99 2.5 terrible gas mileage

ok ill check that out i had no idea a vaccum leak would cause poor gas milage and dosent dividing your miles per tank by the tanks capacity give you your miles per gallon i get 250 to a tank divide that by a 15 gallon tank and that means im getting around 16 mpg
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  #9  
Old 10-09-2010, 09:55 PM
mickblock mickblock is offline
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Default Re: 99 2.5 terrible gas mileage

Just reset your trip odometer next time you fuel up and start keeping your receipts.
After a few or so fill ups read the trip mileage and add up your receipts.
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