gas burning question

w0158981 · Post by **w0158981** » Sun Aug 09, 2009 11:06 pm

so just checked my gas mileage and i got 300km to a tank. which is horrible.
so im going to check everything. here is my list.
clean air filter
new plugs and wires
check cat
air pressure.

my question. it feels like the problem started after i had my new alternator installed is it possible it is running to hard and eating up gas?
also there is oil located in the tube with my spark plugs could this be a problem.

if you have any ideas let me know please

Panhead · Post by **Panhead** » Mon Aug 10, 2009 1:27 am

dont forget O2 sensors. i replaced mine and it runs like a brand new car.

darthroush · Post by **darthroush** » Mon Aug 10, 2009 2:24 am

Oil in the spark plug tubes means you either need new seals, which means removal of the valve cover, or the tubes themselves have worked themselves out a bit.

You say "it feels" like it started after the alternator. What did you feel? I guess, how often do you check your gas mileage, and what is normal for your car? Really, your list should be checked fairly often anyways IMO; especially the last one. I don't think a new alternator is running so hard you have lost major mileage out of a tank of gas either way.

Post by **racer12306** » Mon Aug 10, 2009 7:18 am

So you got 300km's to a tank. How many liters did you put in the tank on that fill up?

miles or km's per tank means squat. miles per gallon or liters/100km is the only true measurement. figure out the liters/100km and then we can figure out if you have a problem.

Napaboy · Post by **Napaboy** » Mon Aug 10, 2009 8:24 pm

300 aint really that bad in stop and go traffic thats all i can really get out of mine 300 to 350 if that was mostly highway then id be worried gotta remember to hot weather and air conditioning will affect that to!

v95 · Post by **v95** » Mon Aug 10, 2009 9:42 pm

god that good i get like 200 to a tank city and 240 highway and i'm not boosted the most likely cause of that could be ur fuel filter cause i have done everything except replace that and that my next step before the 255 pump gets in

Napaboy · Post by **Napaboy** » Mon Aug 10, 2009 10:00 pm

you relise neons and sx2.0s are returnless fuel systems and they dont have fuel filters just strainers on the fuel pump....

Post by **racer12306** » Mon Aug 10, 2009 10:12 pm

remember he is from Canada so he is talking about KM's

DroopDaddy408 · Post by **DroopDaddy408** » Mon Aug 10, 2009 10:13 pm

I've been meaning to put up this topic. It's a damn good question. I get about 200 miles to a full tank. Mostly hwy miles cuz I commute to work 90 miles to work roundtrip. That just doesnt seem rite. But I do kinda have a heavy foot

.

Post by **racer12306** » Mon Aug 10, 2009 10:29 pm

What is your miles per gallon?

Until we know actual fuel economy we can't do much.

Miles per tank is not fuel economy. Miles per gallon or liters/100km is.

Remember Neon fuel gauges are about as accurate as a chinese torque meter.

Moparty08 · Post by **Moparty08** » Mon Aug 10, 2009 10:32 pm

I've been running pretty good lately. Getting decent mpgs in the 32-35 range. My gf's 04 sxt had the gas light on the other day and i filled it up and it only took 9 gallons.

Napaboy · Post by **Napaboy** » Mon Aug 10, 2009 10:34 pm

lol chinees torque meter i get about 37mpg on highway and any were from 27 to 30 mpg in the city assuming the ac is not on and im driving like grandma in the fast lane

v95 · Post by **v95** » Mon Aug 10, 2009 11:13 pm

no mine fills at 9 gallons every time and i still get like 20 to gallon and 24 on the highway trips.

DroopDaddy408 · Post by **DroopDaddy408** » Mon Aug 10, 2009 11:22 pm

I think

I've hit 10 gallons only once. But I havent figured out my mpg since sometimes I cruise to work doing only about 65. Most of the time I'm late and doing between 75 to 80 practically the whole 46 miles to work. Plus it feels like it takes a big gulp of gas just trying to accelerate to the proper speed just to get on the freeway.

Moparty08 · Post by **Moparty08** » Mon Aug 10, 2009 11:25 pm

My 01 doesn't have a gas light that comes on. Maybe there's something wrong with it but one time i did fill up and it took 11.8 gallons.

v95 · Post by **v95** » Mon Aug 10, 2009 11:26 pm

yeah but for the manual my car is rated at 34 high and 27 city and i get 24 high and 20 city,
but i think for the neon the cut the hose in the fuel tank to short so you only use like 8 to 9 gallons on the 11 gallon tank.

Napaboy · Post by **Napaboy** » Tue Aug 11, 2009 12:11 am

i guess the best way to tell wat the hell is really going on is to hook a scanner with live feed or a ob2 recorder and watch and see wat your long and short term fuel trim is doing something simple as a tiny exhaust leak will affect that thus throwing your fuel trim out fuel trim tells all secrets it cant keep a secret!..... just like a bad school girl!

v95 · Post by **v95** » Tue Aug 11, 2009 12:27 am

yeah but my car just passed inspection in nj and they check every thing they area about as anal as cali when it comes to your car and everything checked out when hooked up to the computer

Napaboy · Post by **Napaboy** » Tue Aug 11, 2009 12:56 am

dont mean nothing you fuel trim could be at plus 9 at an idle and it wouldnt throw any red flags but would severly affect your milage and you would notice it cuz of such a small tanks

NoKo · Post by **NoKo** » Tue Aug 11, 2009 2:03 am

wow thats horrible mileage, i live in a city with stop and go traffic and i pull 450km... all i had changed was the sparkplugs even before taht i was getting about 400

Post by **racer12306** » Tue Aug 11, 2009 9:54 am

Guys, seriously. Miles or KM's per tank means jack shit.

Get a real fuel economy number before you start worrying.

darthroush · Post by **darthroush** » Tue Aug 11, 2009 2:15 pm

OK, 300km/37.85L of gas = 7.926 kilometers per liter = 18.643 miles per gallon, yes? I don't see what an instantaneous MPG would be good for, or to calculate your MPGs after every gallon of gas. The only way to be more accurate than above, guessing 10 gallons of gas, would be to fill up, drive, and then fill up the exact same way (stop after the first time the pump clicks off) the next time and then divide the actual number of gallons used.

Is that kind of mileage possible though? Sure. I average around 20-25 MPG where I live due to living in the mountains. Better than my V8's though...

Adionik · Post by **Adionik** » Tue Aug 11, 2009 2:44 pm

I get terrible gas mileage, always have

w0158981 · Post by **w0158981** » Wed Aug 12, 2009 7:30 pm

ok soooo i did the check and i got 9.37/100km no clue what that is in mpg, that is a mix of about 70/30 highway/city

Post by **racer12306** » Wed Aug 12, 2009 11:46 pm

looks like that is 25mpg which isn't too bad. Could be a little better, but some tune up and clean up stuff may help.

Auto or Manual?

w0158981 · Post by **w0158981** » Sun Aug 16, 2009 8:15 am

this is an auto,

heydockyle · Post by **heydockyle** » Sun Aug 16, 2009 11:20 am

I have gotten all kinda mileage out of my car lol.

Just last week went to beach and got 36mpg down with ac on, and 37mpg back without ac on.
Driving around town to work or to the store being easy on it I get 24-28mpg.

Last winter I was out in town beating on it like all night, broke an axle too lol. Only got 13mpg that night.

w0158981 · Post by **w0158981** » Sun Aug 16, 2009 4:23 pm

how hard is it to replace the 02 sensor in our cars? i realize the o2 sensor in the exhaust ios difficult but what about the upper one?

silverneontuner · Post by **silverneontuner** » Sun Aug 16, 2009 7:35 pm

i get the same mileage. 04, ATX, R/T cam, mag intake , header with cat delete. and when i beat the shit out of the car i get even worse economy.

Napaboy · Post by **Napaboy** » Wed Aug 19, 2009 12:01 am

there pretty easy everything is out in the open just get the right socket