General Maintenance & Repairs - Ideas for inprooving gas mileage please

I have a 98 Trans Am WS6 with 125,000 miles stock

I have 315 rear tires, so whats the best air pressure to run for better mileage

Will an OFY and new O2's help?
Already did plugs but still running factory wires

Is there a tune that can be done to improove gas mileage or is the stock one my best bet?

Would doing headers an OFY and and an ls6 intake with a tune improove mileage if I keep my foot out of it?

Thanks for the ideas.

Tune will help the most. Lid, tuneup, 02s, and exhaust will help as well. PLUSSSSS... if you guys want to go hardcore .. (you can research this on ls1.com btw) Add 2 cycle oil to your gasoline....

Offtopic but -- have anymore pics of that Superbee? *drools*

You should design some kind of special intake manifold that had an actuated flap/divider.

60 HP closed and normal HP otherwise. That should lower the cylinder fill and promote fuel mileage.

Open up the EGR port and plumbing until you are
running off 99% fumes ;)

Push the O2 sensor switchpoints down to about
300mV in areas where you cruise and idle. I saw
last night that 450mV was trimming to 13.5:1 by
the wideband but 300mV put it to about 15:1 (on
an over-the-top, cammed & blown 7-liter truck).

Fresher O2s will swing faster and tighter to center
while old crusty ones spend a lot of time "off in
the weeds" and taking you off best mixture for a
larger portion of the time. If not just mis-trimming
you to Fat City.

If you are looking for better mileage to save money, you should be most aware of your return on investment.

For example, you can spend $150+ on O2 sensors, which WILL save a little gas but you will probably not save enough to offset the cost. Headers, intake? I dunno. Probably the same thing. I doubt they return the investment on fuel savings alone. Probably only worth it if you are looking for an added performance gain, as well.

The easy way to save gas is to keep your tires properly inflated. Check the pressures listed inside your driver's door and the pressures on the sidewalls and use the maximum value. The higher the pressure, the smaller the contact patch, the lower the resistance to the road, and the better mileage you will get. (However - your dry traction decreases at the higher pressures.)

The other way to really save gas is to use your brake less! Every time you use your brake, you waste energy (as heat) put in to your car from the engine. (via the gas tank) So, little things like coasting up to and anticipating red lights can save a lot of gas. Smooth out your trip by cutting down on abrupt accelerations and decelerations and your gas consumption should improve. (Of course, ride fun goes down.)

I also spent $85 on doing a MotorVac CarbonClean treatment at a local shop. After that treatment, I got an additional 2 mpg in the city and on the highway, which paid for itself after about 7000 miles.

Get some 16 wheels and tires and run nitrogen in them. Check air and fuel filter. I can pull 33mpg constantly with my A4 car with 2:73's on the freeway at 65mph.

i have lt's !cats! LT's true duals LS6 manifold with no tune yet so i'm gettin the wonderful SES light and i still get above 375 to a tank . . . . btw i'm an a4 also!!!

slow starts slow stops, when your on the freeway try goin only 60 instead of 65 or 70

drive slower.

Buy a 4 cylinder beater.

i have lt's !cats! LT's true duals LS6 manifold with no tune yet so i'm gettin the wonderful SES light and i still get above 375 to a tank . . . . btw i'm an a4 also!!!

slow starts slow stops, when your on the freeway try goin only 60 instead of 65 or 70

amazing!! that must be all highway huh?

Has anyone looked into building a hydrogen generator? There was a guy on the ten oclock news that built one and was getting about 35 mpg in a 89 full size chevy blazer. They say you can build one with less than a hundred bucks.

amazing!! that must be all highway huh?
not all but yeah it's more than 60% highway driving

lol i get around 11mpg city, sub 2k shifting and never getting on it above 3k since it is city. I don't get how everyone gets such great mileage in the city unless they call it city and its really more suburb.

Heres some more pics of the bee:

http://i298.photobucket.com/albums/mm271/superbee_68/Cuda012.jpg

http://i298.photobucket.com/albums/mm271/superbee_68/Cuda017.jpg

http://i298.photobucket.com/albums/mm271/superbee_68/Cuda018.jpg

http://i298.photobucket.com/albums/mm271/superbee_68/Cuda020.jpg

http://i298.photobucket.com/albums/mm271/superbee_68/Cuda021.jpg

http://i298.photobucket.com/albums/mm271/superbee_68/Cuda009.jpg

This is what I started with:

http://i298.photobucket.com/albums/mm271/superbee_68/DSC00246.jpg

http://i298.photobucket.com/albums/mm271/superbee_68/DSC00253.jpg

http://i298.photobucket.com/albums/mm271/superbee_68/DSC00258.jpg

I average 17.7 (so my scan gauge says). At about 65-70 It says im getting about 27-28 mpg. M6 with 3.90s.