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Mpg...
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04SilverBullet
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PostPosted: Thu Sep 17, 2009 11:25 am    Post subject:  Mpg... Reply with quote

After calculating, I got 18.43 mpg.

2004 base, gutted air box. Does that look right to you? My mpg may be lower than expected because it had some dealership work and they took 4 lbs of air out of my tires to 30 psi...
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IffyG
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PostPosted: Thu Sep 17, 2009 11:35 am    Post subject:   Reply with quote

What kind of driving? If I do a full tank of stop and go city driving I'm lucky to see 16, straight highway will get me 32+ and mixed gets about 19. (I've got an L36, but it's probably similar with the LA1)

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skater
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PostPosted: Thu Sep 17, 2009 11:43 am    Post subject:  Re: Mpg... Reply with quote

04SilverBullet wrote:
After calculating, I got 18.43 mpg.

2004 base, gutted air box. Does that look right to you? My mpg may be lower than expected because it had some dealership work and they took 4 lbs of air out of my tires to 30 psi...


I've NEVER gotten that low with mine. And 4 lbs of air isn't going to make that much difference. Something is amiss.

If all you do is stoplight-to-stoplight driving or a lot of idling, then, yeah, it's possible. Or if you have an extremely heavy foot. But if you're driving sanely and it's not all city-driving, your mileage shouldn't be that low.

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04SilverBullet
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PostPosted: Thu Sep 17, 2009 11:43 am    Post subject:   Reply with quote

IffyG wrote:
What kind of driving? If I do a full tank of stop and go city driving I'm lucky to see 16, straight highway will get me 32+ and mixed gets about 19. (I've got an L36, but it's probably similar with the LA1)


80% city, 20% highway. There are some things I could do (change spark plugs, etc.) to get some more mpg, idk.
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IffyG
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PostPosted: Thu Sep 17, 2009 11:46 am    Post subject:   Reply with quote

How many miles are on the car? You might just be at the point where it isn't running as efficiently as it used to.

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04SilverBullet
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PostPosted: Thu Sep 17, 2009 11:59 am    Post subject:   Reply with quote

IffyG wrote:
How many miles are on the car? You might just be at the point where it isn't running as efficiently as it used to.


As of the fill up today, 80,070. Oil, oil filter change, tire rotation at 79,883.
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IffyG
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PostPosted: Thu Sep 17, 2009 12:14 pm    Post subject:   Reply with quote

You can try changing the plugs and wires to see if it makes a difference. If you haven't done a fuel filter yet, it might not be a bad idea to get a new one of those to. Either way, 18 MPG isn't that bad for as much city driving as you are doing.

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PostPosted: Thu Sep 17, 2009 12:42 pm    Post subject:   Reply with quote

I got '00 - 3800II, do about an even mix of city/country driving, and I can get about 25 mpg average. I use cruise a lot out in the country. I try to stay away from the regular "highway"/interstate.

I just took a trip from MI to TN, and got about 29 on the way down with no cruise, and about 30 - 31 on the way back with cruise. That trip was on the interstate.

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PostPosted: Thu Sep 17, 2009 12:43 pm    Post subject:   Reply with quote

IffyG wrote:
You can try changing the plugs and wires to see if it makes a difference. If you haven't done a fuel filter yet, it might not be a bad idea to get a new one of those to. Either way, 18 MPG isn't that bad for as much city driving as you are doing.
Im With Stupid

i reset my scangauge after I fill up. When I drive from the gas station to work, about .75 mile away with 4 stop lights in between, my scangauge registers about 12 mpg. I have a heavy foot and do a lot of stop and go driving. My drive to and from work is about 12 miles on the highway and on that drive I get between 29 and 31 mpg. Again, heavy foot on the highway and lots of hills. My average is somewhere between 22 and 26 depending on how I drive and how many stops I have to make in town.

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PostPosted: Thu Sep 17, 2009 12:44 pm    Post subject:   Reply with quote

Have you changer the fuel filter lately?

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PostPosted: Thu Sep 17, 2009 12:44 pm    Post subject:   Reply with quote

I held out until ~92,000 to do a tune-up on my 04 (base.) Before the tune-up I was lucky if I got 21 MPG (50-50 city/hwy driving.) The summer prior, I installed a homemade FWI, with the filter residing behind the headlight. Well, I kept it there during the winter and the filter's housing ended up rusting out. After buying a new cone filter and moving it back under hood (now it's a "WAI") I picked up ~ 1 MPG.

I then went all out. Changed the plugs, wires, O2 sensors (both,) fuel filter, trans fluid (switched to Dexron VI) and filter, ran some Seafoam through the vacuum hose running to the brake booster, and cleaned out the throttle body, IAC, and MAF sensor. Right now I'm on the high side of 25 MPG (I get close to 400 miles per tank of gas) and occasionally I see 27 MPG. I can easily beat 30 MPG if I go on long trips and keep my speed reasonable.

Just one note. Spend the extra money and get a set of genuine AC Delco plugs and wires (RockAuto sells them for far less than the dealership or the local parts store.) In the past, I've cheaped out on my older cars that had 3x00 motors, and they'd start occasionally misfiring. I've heard the same from other friends of mine who did the same thing with their 3x00 motors as well. I put in Delco Iridium plugs in the Impala (they're exactly the same as the ones that were in the car when it left the factory) and Delco wires. I hadn't planned on replacing the wires, however I ripped the connectors off of 3 of them, 'cause they were practically welded to the plugs (don't forget to use Dielectric grease inside the ends of your plug wires, kiddies!!!)

Oh, and I'm running my summer tires at 40 PSI...

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jkp1187
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PostPosted: Thu Sep 17, 2009 1:10 pm    Post subject:   Reply with quote

In my old 2000 3.8L LS, I regularly got between 14-16 MPG in very heavy stop-and-go Washington DC rush-hour traffic. On the other hand, high 20's were easy on the highway, and 30s possible if I stayed off the accelerator and obeyed all speed limits.

Pumping the tires back up to where they were before would be an easy thing to do that would get you a little bit more fuel economy. I had mine ~ 40 PSI.
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PostPosted: Thu Sep 17, 2009 1:28 pm    Post subject:   Reply with quote

That's worse than I get with the STI when I beat on it. Confused

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PostPosted: Thu Sep 17, 2009 3:49 pm    Post subject:   Reply with quote

32 City, 36 Highway.

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PostPosted: Thu Sep 17, 2009 3:52 pm    Post subject:   Reply with quote

wanderson75 wrote:
32 City, 36 Highway.


Do you drive like an old woman?

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