Before some of you ***** give me crap about complaining on gas mileage on a "30K S/C truck", do not, I have payed for 106,500 miles worth of it...


Recently it has been real bad, like about 8-9 MPG!!!

Just a few months ago I was getting about 14-16 mpg...

Could it be the winter blend gas?

Only thing I have done to the truck different recently was straight-pipes...

 

2 words:

Camper drag.

 

2 words

o2 sensors

 

i live in PA and also notice this each year, as the winter additives for the NE USA are added. we also travel to FLA alot, and i notice once i get out of the additive states, my mileage picks up 2-3mpg.

you can even smell it at the pumps - gives me a headache.

Dave
2001L

 

. .

 

Laugh it up 'mos...



I will have to look into the 02 sensors...

 

I would blame/check your spark plugs before replacing O2 sensors. So many areas of the combustion engine are affected by the plugs including MPG and then again, you may have lost enough torque when going to "straight pipes" that you're having to compensate for that with a 'heavier right foot'?

Dan

 

That is precisely what I was thinking. I knew I would lose some low-end but I do find myself having to press the accelerator farther just to achieve the "usual" pace.

But could it really cost me that much MPG?

Plugs were just recently changed about 5K miles ago...

 

I noticed a serious drop in gas mileage around november/december. I was getting around 9-10. I also noticed that when I let off the gas, my truck slowed down almost like I was using the brakes.
Just a couple days ago, I checked my tire pressure, and they were all around 20 - 25!! It might have been because of the cold weather? Anyway, I returned these to 32, and all is better. You should check your tire pressure.

 

no doubt o2 sonsors. There have been several people that have had pipes put on around home and didn't get the 02 sensors put back in. They experienced a serious drop in mpg. If they left you o2 sensors out that is likely the culprit

 

Tire Pressure is good.

For the straight pipes only the muffler was removed so did not mess at all with the o2 sensors. They be in need of replacement though.

 

100K+ miles on the original 02 sensors, there's your answer.

 

our new winter gas does in fact lower the mileage, but that winter gas is keeping me in overtime, so it can't be that bad

and

Sir Speedin hit the nail on the head

 

i dynoed open headers, didnt loose any low end and gained 5 hp. since then though i took off my cutouts

 

My POS Jeep Cherokee is burning AT LEAST 1/4 tank a day,
and I don't think I put 30 miles a day on it.
Sometimes I think that big *** 4.0 straight 6,
is worse than the Lightning .
Either way it cost me 30-40 a week just for the work, lunch, and home routine. The jeep is prob @ 12-14 MPG, and the Lighting,
9-11 MPG.