Bad Gas Mileage

N29468 · April 16th, 2009, 01:13 AM

First How many miles should i get reasonably on a full tank of gas?

I have LT Headers, O/R Hpipe, Flowmaster catback, and a CAI. Ive been getting pretty crappy gas mileage lately and was wondering if it could be the o2 sensors. If i had a bad o2 sensor would my check engine light be on? Ive seafoamed the car and its still sucks. I only have about 48,000 miles, what do you guys think? I’m selling my car to my friend soon and would like to fix the problem first.

goren813 · April 16th, 2009, 10:51 AM

Have you gone to an auto store for them to see what code it's throwing? Then you'd know what the light was on for, it could be the 02's, if they're bad it'll throw a code. This MAY affect mileage, how bad are we talking? Driving as sensibly as possible I'm at 20mpg... led foot syndrome and it's more like 17-18.

N29468 · April 16th, 2009, 11:05 AM

Last tank i filled it all the way up and got about 230-240 miles on the tank which is pretty bad. Ill go to autozone and see what codes its throwing.

stangcharger · April 16th, 2009, 11:08 AM

Originally Posted by N29468

Last tank i filled it all the way up and got about 230-240 miles on the tank which is pretty bad. Ill go to autozone and see what codes its throwing.

how many gallons were consumed?

in my mustang i usually fill up at around 10 gallons consumed. and still get over 20mpg on highway which is alittle over 200 miles. my in town sucks though.

N29468 · April 16th, 2009, 11:17 AM

That time i ran it pretty low. Then i held down the Trip button and started the car and added the rest of the miles. So basically thats a full tank consumed.

goren813 · April 16th, 2009, 11:19 AM

It's a 15.5 gallon tank, normal full fill is about 14.5 gallons, I get around 280 miles out of that.

buddyantunez1 · April 16th, 2009, 11:22 AM

i have your mods + some and im seeing around 220-250 to a tank in town. so mine isnt that great either and im not throwing a CEL.

N29468 · April 16th, 2009, 01:49 PM

Yea i went to autozone and im not throwing a code. I dont no what it is because if a full tank is 14.5 that means im only getting about 15mpg wtf. It doesnt matter because im getting rid of it soon but theres got be be something wrong.

goren813 · April 16th, 2009, 02:11 PM

Cleaned all your filters and replaced spark plugs and fresh oil? General things as such can help sometimes, there may be a larger underlying issue, but you said only 40somethin k miles... If you want to take the time do all those minor things you may see an improvement, and just be extra grandma-ish behind the wheel for a bit and see if it helps any.

white03v6 · April 16th, 2009, 02:23 PM

have you checked your tire pressure lately?
my was low and i was only getting low 20s, but i took care of that and im back to mid-20s. (the winter just ended, and the cold weather really takes a toll on your tire pressure)

and are some of the reserve tanks larger than others? because i was almost at E and i barely hit 13 gallons when i filled up. i usually get ~280 miles and fill up with ~11 gallons so ~25mpgs for me with more highway, but still a pretty good amount of city driving.

goren813 · April 16th, 2009, 02:55 PM

It's weird I don't think the reserves are bigger I think it's the sensors... like your low fuel light will go on sooner, when in reality you could drive another 50 miles... when my light goes on I take it almost til the needle is past the red and I've never run out of gas. At that point it fills to 14.5 so I still have a gallon left which means another 20 miles! so really out of a FULL tank you should be around or over 300 miles... but +1 to tire pressure I forgot to mention that, my dad has an air compressor I use every month or so to top my tires off.

white03v6 · April 16th, 2009, 03:19 PM

ah i c. but i hit somewhere in the low 300 miles when i filled up for that low 13 gallons. and its only like 75 cents at a gas station to fill up your tires.

N29468 · April 16th, 2009, 04:26 PM

My tires are fully inflated i checked it the other day.

N29468 · April 16th, 2009, 04:56 PM

Its fine im going to sell it very soon and it still has a warranty till august so my friend can take it in if he wants. I bet its partially the spark plugs because i haven’t touched them yet.

06dkkiser · April 16th, 2009, 09:48 PM

did you check your tire pressure with a guage or just look at your tires? I thought mine was full one time and I only had like 14psi in them when its actually supposed to have around 32 - 34 or so. Thats my tires though. Yours might require more or less.

fastbackboy22 · April 17th, 2009, 11:01 AM

Originally Posted by N29468

First How many miles should i get reasonably on a full tank of gas?

I have LT Headers, O/R Hpipe, Flowmaster catback, and a CAI. Ive been getting pretty crappy gas mileage lately and was wondering if it could be the o2 sensors. If i had a bad o2 sensor would my check engine light be on? Ive seafoamed the car and its still sucks. I only have about 48,000 miles, what do you guys think? I’m selling my car to my friend soon and would like to fix the problem first.

clean your air filter...and lay off the gas pedal

joparrett · April 17th, 2009, 11:08 AM

I consistently get 200 miles/tank with in town driving. And nothing is wrong with my car... I would be thrilled to get 250 miles/tank

24KStang · February 12th, 2010, 12:09 AM

I get pretty bad mpg also, I thought I would be saving gas by going with my v6..lol

mcqueen · February 12th, 2010, 12:15 AM

My car doesn't seem to care too much about how I drive. Either way I end up getting about 170-190 per tank. Then again I need new plugs, wires, front O2 sensors, and fuel filter pretty bad..

sickfox · February 12th, 2010, 12:24 AM

OLD ASS THREAD PEOPLE JESUS!!!!!!!!!!!! No one pays attention!

April 16th, 2009, 10:51 AM	#2
goren813 MM's Official Lucifer '00 3.8L & '05 4.6L Join Date: Apr 2008 Location: Odessa, FL Posts: 3,620 iTrader: 0 reviews	Have you gone to an auto store for them to see what code it's throwing? Then you'd know what the light was on for, it could be the 02's, if they're bad it'll throw a code. This MAY affect mileage, how bad are we talking? Driving as sensibly as possible I'm at 20mpg... led foot syndrome and it's more like 17-18. __________________ "Fast she goes...in the city of Overdose"

April 16th, 2009, 11:19 AM	#6
goren813 MM's Official Lucifer '00 3.8L & '05 4.6L Join Date: Apr 2008 Location: Odessa, FL Posts: 3,620 iTrader: 0 reviews	It's a 15.5 gallon tank, normal full fill is about 14.5 gallons, I get around 280 miles out of that. __________________ "Fast she goes...in the city of Overdose"

April 16th, 2009, 11:22 AM	#7
buddyantunez1 November 08 ROTM 2000 3.8L Mustang 195.9/220.8 hp/tq N/A Join Date: Sep 2008 Location: Cleveland MS/Stafford VA Posts: 1,370 iTrader: 0 reviews	i have your mods + some and im seeing around 220-250 to a tank in town. so mine isnt that great either and im not throwing a CEL. __________________ ~Nitrous is like a Hot Girl with STD's, you know you wanna hit it, but your afraid of the consequences~

April 16th, 2009, 02:11 PM	#9
goren813 MM's Official Lucifer '00 3.8L & '05 4.6L Join Date: Apr 2008 Location: Odessa, FL Posts: 3,620 iTrader: 0 reviews	Cleaned all your filters and replaced spark plugs and fresh oil? General things as such can help sometimes, there may be a larger underlying issue, but you said only 40somethin k miles... If you want to take the time do all those minor things you may see an improvement, and just be extra grandma-ish behind the wheel for a bit and see if it helps any. __________________ "Fast she goes...in the city of Overdose"

April 16th, 2009, 02:23 PM	#10
white03v6 Hardcore Enthusiast 2003 V6 Mustang Too long@Too slow Join Date: Oct 2008 Location: NC Posts: 2,649 iTrader: 1 reviews	have you checked your tire pressure lately? my was low and i was only getting low 20s, but i took care of that and im back to mid-20s. (the winter just ended, and the cold weather really takes a toll on your tire pressure) and are some of the reserve tanks larger than others? because i was almost at E and i barely hit 13 gallons when i filled up. i usually get ~280 miles and fill up with ~11 gallons so ~25mpgs for me with more highway, but still a pretty good amount of city driving. __________________ NCMM Co-Founder NCMM Website NCMM Forums Last edited by white03v6; April 16th, 2009 at 02:27 PM.

April 16th, 2009, 02:55 PM	#11
goren813 MM's Official Lucifer '00 3.8L & '05 4.6L Join Date: Apr 2008 Location: Odessa, FL Posts: 3,620 iTrader: 0 reviews	It's weird I don't think the reserves are bigger I think it's the sensors... like your low fuel light will go on sooner, when in reality you could drive another 50 miles... when my light goes on I take it almost til the needle is past the red and I've never run out of gas. At that point it fills to 14.5 so I still have a gallon left which means another 20 miles! so really out of a FULL tank you should be around or over 300 miles... but +1 to tire pressure I forgot to mention that, my dad has an air compressor I use every month or so to top my tires off. __________________ "Fast she goes...in the city of Overdose"

April 16th, 2009, 03:19 PM	#12
white03v6 Hardcore Enthusiast 2003 V6 Mustang Too long@Too slow Join Date: Oct 2008 Location: NC Posts: 2,649 iTrader: 1 reviews	ah i c. but i hit somewhere in the low 300 miles when i filled up for that low 13 gallons. and its only like 75 cents at a gas station to fill up your tires. __________________ NCMM Co-Founder NCMM Website NCMM Forums

April 17th, 2009, 11:08 AM	#17
joparrett Regular 2003 Mustang 3.8 slow Join Date: Apr 2008 Location: Indiana Posts: 157 iTrader: 0 reviews	I consistently get 200 miles/tank with in town driving. And nothing is wrong with my car... I would be thrilled to get 250 miles/tank __________________ Jordan \| 2003 Mustang 3.8 \| SCT Tuner by VMP \| CAI \| Flowmasters \| ZEX 75 shot

February 12th, 2010, 12:09 AM	#18
24KStang Newbie 2k 3.8 5spd Not yet.. Join Date: Feb 2010 Location: San Diego Posts: 43 iTrader: 0 reviews	I get pretty bad mpg also, I thought I would be saving gas by going with my v6..lol

February 12th, 2010, 12:15 AM	#19
mcqueen Dancing Naked In The Rain Join Date: Oct 2009 Location: Ozark, MO Posts: 15,719 iTrader: 0 reviews	My car doesn't seem to care too much about how I drive. Either way I end up getting about 170-190 per tank. Then again I need new plugs, wires, front O2 sensors, and fuel filter pretty bad..

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