I usually find your posts informative and interesting, but I think your comments above are kind of dickish.

Some of us wanted a big car with performance that gets decent mileage. I don't know about yours, but my Impala carried an EPA rating of 28 Highway/18 City. This had an impact on my purchase, since we drive 100% highway to the tune of a 1000 miles per week. Had we known the car was going to get 24 or so on the highway, we would not have bought it. I'm just speaking for me. Can't say what other poster's motives are.

Anyway, with gasoline topping $4.00 per gallon in a lot of places, it's very reasonable for people to ask how they can better their mileage. After all, many of them bought their cars when gas was half this price.

I, for one, don't want a 4-banger. I simply wanted my Impala to do better. It does and it's because I gathered info and made changes.

Please don't tell us what we should buy, just because you don't like seeing the thread. If you have a problem with it, then just ignore it.

 

I just get sick of reading these threads every month. People complaining about gas is a pet peeve of mine. Yeah I know I could ignore, it but sometimes these threads could be something good so I open it and read and then find that they are the same old crap.

Gas is expensive, we all pay it and there is no way around it, other than public transportation. And even then you are paying the increase because when oil goes up everything goes up do to the costs to get it to you.

I completely agree with your post, and thanks for the compliment. EPA ratings are BS, I hope we all know that. EPA tests the perfect storm which almost never happens. More likely is a 10-25 percent reduction and based on the numerous posts I have read that seems to hold true. (fuzzy math in my head) Here is a real world solution for you. Drive less, ride your bike to work, etc. I do those things so I can keep my car and afford my car.

I should mention that yes you did make changes, which is good, you are one of the few that have. I commend you on that. Most come on here post about it and guess what. They don't get a tune or a KandN or any other mod. Heck they probably don't even feather the pedal. They just expect the car to get the mileage the EPA tells you. I am sorry to break it to people but the government is not a fountain of truth.

To close bitching about mileage is like a being in a rocking chair, gives you something to do but doesn't get you anywhere. So to address your don't tell us what to buy. Buying one of those cars will get you farther on the same dollar, just providing you a solution, a solution that will work.

Off my soap box. Dick mode off. Resume not reading threads.

 

Exactly...All the more reason to make the car use of less of it. I've posted about how removing the cat and the overtemp routine while doing a tune can really improve mileage. Hopefully, people will give this a try because you get to have your cake an eat it, too: Better MPG and HP!

Your % reduction in MPG is accurate, in most cases. I do consider the LSx motors to be different, though. This is the fifth LSx car I've owned, and all of the others exceeded their EPA ratings when driven by me on the highway. My heads/cam/longtubes '99 Camaro SS M6 would pull down 29 MPG on the highway, no sweat. In fact, these motors have a reputation for fuel efficiency and doing much better in the "real world" than their ratings would suggest. Of course, little did I know that the LS4 would be equipped with a 3000-stall converter that drinks gas like an F-16 on afterburners!

Amen, brother!

 

Yes those changes will help, but people would need to actually do them. Like Home Depot, "More Doing".

I would agree, the LS series motors other than the LS4 have been an MPG "miracle" in regards to performance vs MPG. (The Vette takes the crown but that has a lot to do with weight) Like you said, it has to be that converter and possibly the 4 speed trans, there just don't seem to be enough other differences other than DOD, which other motors have. And on the subject of DOD, Lew has pointed out DOD has mixed results. For some-most (no accurate statistics) do better with it disabled.

 

Hey LS1 Racing...

When you rebuilt/strengthened your trans you said you went with a lower stall tc...

Have you noticed increased mpg in the city/highway?

 

We don't drive enough in town to notice any change in city mileage.

My highway mileage went up anywhere from 3-5 MPG, but it's more likely that the removal of that cat and the updated DiabLew tune had more to do with that than anything else.

Remember, the converter is locked at highway cruise, so any change in stall isn't going to impact MPG at those speeds.

The tighter converter does feel better in town, and the car doesn't have as much slop in the throttle. It also has a little creep now. So, drivability is much improved.

 

This is great, my wife gets weirded out that the car just sits there without the brakes being pressed.

 

Yeah, the stock converter feels pretty unnatural. I'm so glad to be rid of that.

 

My pet peeve is people compaining about something they don't have to read.

One thing I seem to gather from all this is the transmission is a big loss of gas mileage.

 

To be technical no one has to read any of this site, and if that were the case no one would get any of their questions answered... So be glad that people read threads eventhough they don't necessarily want to because then you get answers!

PS Glad to contribute to your pet peeve.

 

I average 26 to 28 65mph at 55 I get 30 to 31 I get a lot better then my wifes 06 impala with a 3.8 I have superchips cortex 2950 programmer,a true cold air,10mm spark plug wires with ugk iradium plugs,and deleted my mufflers with 3.5 inch tips

 

i do enjoy you guys going at it, a little ! we all learn some things that will help our mpg ! p.s.emersonhart13 - your wife is a 10 ! only busting a little ! rkvette

 

Actually she is, thanks for noticing! lol HAPPY FRIDAY!

 

well when gas was 2.50-3 dollars it wasn't an issue now premium is about 4 and rising its kind of a serious problem im just trying to figure how to increase the fuel economy somehow

 

if you have an air intake and your maf isn't tuned.......that will lower mileage.

EDIT: actually I see all you have is a drop in, that shouldn't affect mileage. I would check mechanical condition. IE, plugs, wires, O2's, injectors etc.

 

more tips ? tape grille up /bump draft[areo nascar]/ wax impala 20 times/ keep clean at all times/ never turn on air cond./ pump up all tires to 50 psi./ burn highest octane ,no matter what cost is/ install raw egg or wood block under gad pedel / never speed or take off ,fast/ etc. did i do all of these tips-no ! our impalas are as someone said a pig /mpg ! just busting on some of these tips ! my zo6 vette is great on mpg, if i can stay off the gas pedal . b/c its light just over 3,000 lbs / very areo/ 6speed seems like double overdrive ..somtimes wish would have lived somwhere where vette could be driven more often ? rkvette