Gas Mileage Problems

97Vicious281

New Member
Jul 21, 2005
35
0
0
Atlanta, GA
This has been getting worse as time goes on back in late July I changed out the plugs and wires thinking I would get better gas mileage. Wrong. It has progressively gotten worse from like 320 miles to a tank to like 280 and now it flucuates from 220-260 since I got flowmaster mufflers installed. Any suggestions on what to do. It's really starting to get increasingly annoying considering gas is about to go up again.
 
What is this gas "mileage" thing of which you speak? Is that a gasoline additive that makes the car go faster? :scratch:

Seriously though a lot of things affect this including the fact that cars get worse mileage in cold weather.

How many miles on your fuel filter?
 
I don't think the fuel filter has ever been changed. It's got 95000 miles on it. All I did was change the spark plugs and plug wires then it got like 40 to 50 miles less a tank. Then I got flows and now I get like another 30 less.
 
Change the fuel filter asap. You sure you gapped the plugs correctly? If you are reading this and thinking "They come pre-gapped!" .. they still need to be checked anyway.
 
#1 - Change the fuel filter!!!!

#2 - My fuel mileage has always dropped for a while after I changed a part of my exhaust. Not because of the exhaust, mind you, but because I didnt shift as early as I used to. I just wanted to hear the sound of the exhaust. When I did the cat-back, I found myself turning down the radio at stoplight just so I could get on it. After a month or so, that got old, but then again after I did the LTs and the O/R X I did the same thing. Are you doing this? That will cut an ass load out of your MPG, I dropped from 280 miles on a tank to almost 220, but after I would quit, right back up to 280.

Just my .02 tho......
 
I'd say give it some time. I think mine dropped too when I first put in Borlas. Also, check your tire pressure. Make sure you're not running on 20lbs. or something.

Edit: Or maybe you were real lean back then where you were getting 320. You had a CAI to get the air in but no exhaust mod. Only time I (5speed 04 gt) get above 300 on a tank is on a road trip. Generally, I am around 260-280 per tank. Just got a tune, so I'm going to be checking again.