Just as the title says......My gas mileage has taken a quick "drop" in the past 3 fill-ups....I have NO idea why...My driving habbits havent changed at all...

It went from the usuall 14/16 mixed city-hwy

to 10/11 mixed city-hwy....Yeah not good...

I understand that the oil manafacturers put an additive? in the gas when the weather starts getting colder?

Any suggestions?

 

This is a really wide open question.

One thing that can hit you hard is when your oxygen sensors get some miles/time on them and get lazy. The result is poor mixture control. When this is the problem, a new set of upstream sensors can often bring the MPG right back to normal.

Another problem could be your MAF sensor. It can get contaminated over time especially if you run an oiled gauze filter like a K&N. Another possibilty could be a VERY dirty air filter.

Gasoline is reblended about 4 times a year in most of the U.S. to make it compatible with the expected average temperatures.

You could be using a fuel with alcohol added but that is limited to 10% in Michigan in any fuel labeled as "unleaded gasoline". That would cost some fuel economy but not more than 1 MPG. If it has any alcohol added, regulations require it to be labeled as such.

 

would cleaning the MAF really get u better gas mialage say if u have never aleaned it since 99 when the car was bought, and if so what the best way to clean it??

nick

 

Also the colder the air the more dense it is and the more fuel needed to maintain the air/fuel ratio. Colder temps result in better power and use more fuel.

 

ooo i like more power

 

i noticed that too these 33s are killin me lol...100 miles at a half a tank..man that sucks but i guess thats what you gotta do for pimp tires :)

 

I'll check out the MAF tomorow bob, its the sensor in the air tube, right?

And what should it be cleansed with?

thanks!

 

i getting about 90 per half tank right now and its hurting my wallet!!

 

mine has gone down too...

 

Yah and you have smaller tires...

 

would it prob make a diffrence?? and is it easy to break because i break stuf really easy
thanx
Nick

 

Awesome, thanks D.

and am i correct on this-VV

yah i wouldnt really know where it is, i never have had to mess with it! haha

 

take your air filter off like your changin it..the tube that you lift up lookin it..see that little metal thingy thats it..

i didnt know if you were askin or what..so i thought id explain anywayz

 

The MAF sensor is in the black plastic part screwed to the air filter housing. The hot wire is inside. It looks similar to this Granatelli MAF assembly:




Don't touch it with anything like a rag or your fingers. Just hose it down good with the contact cleaner.

 

Mine is just as bad all the time. Maybe I will give cleaning my MAF a shot when I get home from school for thanksgiving.

 

and to think Sarahs actually got better with the 285s...weird.

 

i've lost 30-70 miles per tank in the past couple of weeks, nothing changed to the truck. But i think because it's been really windy and cold out, that would have an effect. But i only let it warm up like 3 mins before i leave[i used to let it idle about 2 min before i was ready to move when it was warm].
Have you had an alignment lately? I was getting horrible gas milage this tank, 85, and i was just around 3/8ths full, i got an alignment today[and it was bad] and i drive 50 miles tonight, mixof highway and town, and i'm barely before a 1/4 tank, if not right at it.

 

several factors can affect gas milage. like what most said anything from actual sensors to allignment. could even be a bad batch of fuel, it will take a few tanks to get all the bad gas out. and dont forget tire pressure...

if ur truck has 100,000 or more miles id change the o2 sensor anyway. also cleaning the MAF, TB and IAC could be done. i usually clean my TB and IAC every 6 months, but i dont drive that much.

 

whers the TB and the IAC and how would u clean it?? i g2 do everything so i dont go bankrupt on gas

 

i just tryed to clean my maf and it has special screws on it do i need to buy something special from dealier to take it out it looks like a tourks but with a raise in the middle so the driver has to be hollow in the middle

 

you should be able to see two lil wires in the maf, spray them with the cleaners. thats what you clean.

there shuold be two lil wires in the lil hole inside the maf.

 

Those are tamper-resistant Torx. You can either try to break the pins out of the screws or buy an inexpensive bit set to fit a screwdriver that accepts them.

Or you could avoid that problem by not removing the MAF from the housing and just cleaning it in place. Don't get any of the cleaner on the air filter element.

 

can i just unbolt the box or do i have to take out the whole thing?? i bleave mine is metal around the maf, is it ok to spray contact cleaner through the tube wile still connected to the engine, also i using LPS contact cleaner

 

I would just take the air cleaner cover off and remove the element, then remove the large air tube from the other side of the MAF housing and spray it in place. Let it all dry out and reassemble.