My gas mileage has gone down the drain..suggestions?

[bigbrian442]

Re: My gas mileage has gone down the drain..suggestions?

The two main things that will effect the fuel mileage is the thermostat and O2 sensors. Disabling the EGR will drop mileage up to 2 MPG. Torque reduction may be playing a part in this as well. If the motors not limited to only make X amount of torque in overdrive and it now can make as much as the timing / fuel will let it, it may be using more gas. If all else fails put the stock tune back in it and see if the mileage comes back. I don't think the trans shifting and CAT code would effect the mileage at all, The trans shifting harder should even help it go up.

[midnightblue3800]

Re: My gas mileage has gone down the drain..suggestions?

what about coil packs have you checked them

when my coil pack when out i thought that my tranny was tacking a crap on me.

[TheGr8Schlotzky]

Re: My gas mileage has gone down the drain..suggestions?

I swapped out my t-stat and did the pcv as well just because I was in there. Both items looked fine when I took them out, though the old thermo gasket was shredded by the time I got it off. I did notice the temp gauge showed closer to the middle while I was topping off the radiator, so I suppose it could have helped.

I've been paying extra close attention to the car lately and I've noticed I get a slight misfire in the first 10 seconds of some (very few) cold starts, and when cruising up a hill in 4th at 45 (tc locked), the rpms are a bit inconsistent. The only thing left to cause this is coil packs, so I figure I will change them out. Any recommendations on coils?

These will be fine?
http://www.autozone.com/R,APP35800/v...ductDetail.htm

[bigbrian442]

Re: My gas mileage has gone down the drain..suggestions?

What gears did you have in the rear when you got 29 mpg and was the PCM tuned for those gears then?

[TheGr8Schlotzky]

Re: My gas mileage has gone down the drain..suggestions?

yeah, I'm Y87, so 3.42s and I was running a stock tune at the time, but it didn't seem that the tune was the turning point to bad mileage.

[Shad0wguy]

Re: My gas mileage has gone down the drain..suggestions?

I'm following this thread. My Camaro is averaging 19MPG as well.

[bigbrian442]

Re: My gas mileage has gone down the drain..suggestions?

I've seen complaints about the non GM coils not lasting very long. It seems hit or miss with them. Some are fine , some burn out quickly.

[TheGr8Schlotzky]

Re: My gas mileage has gone down the drain..suggestions?

I've seen those complaints about accel coils, but haven't noticed anything negative against anything but ac delco. I suppose I should look around some more and decide if it's worth it.

[TheGr8Schlotzky]

Re: My gas mileage has gone down the drain..suggestions?

My car has never run this hot before, so I'm noticing something wierd with the oil pressure. On start up and up to the 1/4th mark on the temp gauge (where it used to stop) the oil pressure is right in the middle. But once I'm warmed up, (almost to half now), at idle the oil pressure drops. Here's a quick cell video showing what I'm talking about.



is this normal?

[PalmHarborBlkv6]

Re: My gas mileage has gone down the drain..suggestions?

Okay, this will knock your socks off: put 3 oz of pure Acetone in a filled camaro tank ...filled with regular gas...not ethanal ....it will also increase your gas mileage.
Read the posts of people who have done this:

http://www.wisebread.com/can-acetone...ur-gas-mileage


There are many personal examples of people getting great results and it turns out that
many commercially available branded products have a lot of Acetone in it.

Go to the URL above and read the 60 testomonials....no one is selling anything here.
There is no hype. One quart at Home Depot cost $6.00 less than two gallons of gas

[bigbrian442]

Re: My gas mileage has gone down the drain..suggestions?

As long as the oil pressure goes up to the middle of the gauge when you step on the gas, I wouldn't worry about it. If it bothers you allot go to the next heavier grade oil, only in the warmer months. The temp gauge belongs right in the middle with a 195 stat. Find the miss and you millage should come back. Check the air pressure in your tires as well.

The video on that page is FOS! Acetone may help at best 2-3 MPG when you start using it. The added MPG goes away the longer you use it. By no means will it double you mileage.

[PalmHarborBlkv6]

Re: My gas mileage has gone down the drain..suggestions?

No one said you would go from 18 to 36 mpg. But a the prices we pay now a few mpg increase is a good thing

[bigbrian442]

Re: My gas mileage has gone down the drain..suggestions?

Go watch the video and see what it claims he picked up from the acetone.

[PalmHarborBlkv6]

Re: My gas mileage has gone down the drain..suggestions?

Look, if you buy Ammonia from Walmart for $1 a quart, it will clean up your kitchen floor better than Mr. Clean and the others for a third the price....but its just Ammonia so people say...no I like to pay more...cause
I saw it on FoxNews and its always fair and balanced.

[landj]

Re: My gas mileage has gone down the drain..suggestions?

Oh man I completely agree, FoxNews rocks! A breath of fresh air from the completely dog-wagging hippies on CNN.