i was wondering the reason and theory behind more MPG, what needs to be done.

Thanks.

stop stepping on the gas.

don't drive.........http://www.theunholytrinity.org/cracks_smileys/contrib/dvv/cwmstone2.gif

Wow you guys are just so darn witty. :rolleyes:

Thinner oil (actually says this in the manual), short shift, don't use a/c, keep windows rolled up, buy a Prius!

That said, you'll save a tiny bit of $$. Not worth it IMO.

Ed

The time-honored method of achieving good gas mileage has been to accelerate slowly and up-shift at relatively low RPMs. The 2002 Impreza Owner's manual endorses this method. It says:Always accelerate gently until you reach the desired speed. Then try to maintain that speed for as long as possible.The manual also provides these up-shift RPM recommendations:
http://www.i-club.com/forums/attachment.php?s=&postid=892450
However, recent research suggests that the classic advice, "accelerate slowly," doesn't produce the best gas mileage. Instead, you should "accelerate briskly" (I'd say about 40 percent of wide-open-throttle). You still should up-shift at a relatively low RPM, though. Here's a link to a description of this widely-reported research that provides more details:
http://www.nfia.com/html/news/archives/news010607.html

Using a thinner oil, such as 5W-30 instead of 10W-30, can produce a slight, but usually imperceptible, improvement in gas mileage for any individual car. However, if everyone in the country were to switch to 5W-30, then there would be a measurable increase in the country's average fuel economy, and that's why 5W-30 oil carries the endorsement "Energy Conserving."

EDIT: Fixed link.

If you really want to get better MPG then buy another car :D The WRX just wasn't meant to get good mileage. I believe the sticker promises around 20-27mpg, ...I think I average 21mpg and have seen 25mpg once.

For the performance it isn't that bad, and thats hopefully why you got one :)

I'm sure you will enjoy it!

-anders

Drive downhill a lot!;)

I have a great device for you, and it cost next to nothing!
Find a piece of small wooden block (you can probably find it anywhere.) and place it right underneath your gas paddle! This way, you can prevent the "heavy lead right foot mod" ever from happening again! we all know that the heavy right foot mod is the most gas costly mod you can do to the wrx.

Let's see, more MPG.. Park the Scoobie and buy a Golf GL TDI. That should about do it.

duh?

lb
www.trancelab.com

wouldn't recommend putting a block under you pedal... that's just dangerous in many ways...

I've never understood why they say accellerate slowly saves gas... I can understand flooring it isn't good for gas mileage, and even dropping the pedal 2/3 of the way probably wastes a bit, but if you smoothly and "briskly"(as they put it) push down on the pedal, I've found that I can get great mileage that way... of course you still have to shift short... in my VW that meant before 3k, but the RS, w/ it's short gearing is hard to keep under 3k in the lower gears, so I try before 3.5k.
I've also heard reports that basically all say "modern cars are designed to run as efficiently w/ the A/C as w/ the windows down"... In no car that I have ever driven has this been true... windows down and a/c off seems to make only slightly less mpg than a/c off windows up... where windows up a/c on will make a significant difference... even on the highway where wind is a big factor... not to mention, it's more fun w/ the windows down...

Another way to keep the MPG up is to keep up on your preventative maintenance. Oil changes, spark plugs, filters.. ect..

Thanks for the responses. I was trying to get the theory behind mpg.

Does it have something to do with engine? It doesn't necessarily have to be a wrx but, just in general,how do people increase the MPG listed on the car?..

THANKS...

super efficient motor, things like good atomization of the fuel, lean mixture tolerant, high compression, good breathing.

Car design as well, things like light weight, low drag, small tires.

Chad
93 1.8T

Originally posted by mrbell
wouldn't recommend putting a block under you pedal... that's just dangerous in many ways...

I've never understood why they say accellerate slowly saves gas... I can understand flooring it isn't good for gas mileage, and even dropping the pedal 2/3 of the way probably wastes a bit, but if you smoothly and "briskly"(as they put it) push down on the pedal, I've found that I can get great mileage that way... of course you still have to shift short... in my VW that meant before 3k, but the RS, w/ it's short gearing is hard to keep under 3k in the lower gears, so I try before 3.5k.
I've also heard reports that basically all say "modern cars are designed to run as efficiently w/ the A/C as w/ the windows down"... In no car that I have ever driven has this been true... windows down and a/c off seems to make only slightly less mpg than a/c off windows up... where windows up a/c on will make a significant difference... even on the highway where wind is a big factor... not to mention, it's more fun w/ the windows down...

it was a joke man.. :alien:

I won't "step on it" if I am going from stop light to stop light. The idea of accelerate brisky is to have longer "cruising period" and shorter "accelerate period". If you are going to slow down or stop very soon, the cruise period will be short and you waste more fuel.

Best way to keep good mpg is to keep the engine in optimal condition. It will burn cleaner and more efficient thus waste less fuel.

If you still want more mpg, keep the rev low, take out unused items in the car (spare tire and jack is not recommended). You could also inflate the tire a bit more, but you will worse the braking performance since there is less contact path.

The image below shows the relationship of the factors which affect fuel economy. I assume you won't be modifying your engine or transmission, so that leaves only the External Resistance Factors to play with. Most of the ideas mentioned above (but not that 2x4 thing) are excellent. One factor over which you have direct influence is braking resistance. The harder you brake, the more it costs your fuel economy. Try to reduce braking needs by anticipating.

my mileage got way better when I put the Borla header on...

Yes, exactly what I am heading towards.

Its physics right?.. Work over Total work.

Woop. Thanks, Jon.

"I can't upshift yet, honey... the lambda isn't within mu of x sub z!"

http://i-club.com/forums/showthread.php?s=&threadid=103122


Jealous?