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Discussion Starter · #1 ·
Just got my IS3 bout a month ago- and i noticed that i get really bad gas mileage!!! So how do you guys get more outta your premium fueled tanks??? esp now that the price of gas is outta control!

thanks!
 

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drive slower :D
for real, cruising in the right gear/speed and accelerating at a decent rate is the only way to get decent gas mileage ( higher than 20, but not much higher)
 

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SRT Intake system will increase gas mileage by 1-2 MPG.
Manual transmission gets better mileage.
Driving in "SNOW" mode in traffic will consume less fuel.

Other than that, the way the car is geared for performance/responsiveness, not much can be done.
 

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If you don't care about acceleration or drive in traffic alot, put your SNOW button on. Should be good for +2 MPG or so...
 

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One way to do it, and this is a proven fact, is to take a bus. You'll be amazed what it does to your gas mileage!!! :crazy:

I was quite disappointed about the mileage myself - our RX300 AWD gets the same 18 m/g :whine:

Skits/ground kits won't help. The whole idea with many kits is to give you better air dynamics but unless you take your car to the track the difference won't be noticeable.

One thing, that's really a no-brainer, is that try not to gun it from every stoplight: my wife was getting 19.5 m/g and whenever I drive it drops to about 18 m/g - my driving is a bit more aggressive. Keep your revs under 3K and do not put it into the "power" mode.
 

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On highways, I noticed a big difference if you set cruise control at 80mph vs. 85mph. I got 27~28mpg at 80mph but only 22~23 at 85mph, I might have gotten over 400 miles a tank @ 80 if I my trip was that long.

So moral of the story: drive below 80mph on a long trip.
 

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Discussion Starter · #10 ·
yah.. i knew someone would offer up the 'take the bus..' thing :roll:
guess there really is no way to make this heavy car more fuel efficient than to gently roll out at all times and the other 'smart' stuff...
damn premium fuel is soo $$ now too dammit!!! :pissed:
 

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First, define "bad fuel mileage". Some people thing 17 is bad, others think 22 is bad.

The tips already given are good in general.

The AFR (air to fuel ratio) is our engines is roughly constant at stoich, ~14.7:1. Them ore air that you let into the engine -> the more fuel. Don't let so much air in (lay off the accelerator pedal) and less fuel will be used.

Around 10k miles, my car peaked in fuel consumption and has been rather steady since (37.5k now), save winter blends of fuel used in my area. Arund 10k miles, I started using Mobil 1 oil and filters as well as intake. I jumped about 2-3mpg from when I bought the car. How much was break in vs. my changes? I dunno, but that is not why I did them.
 

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brc said:
yah.. i knew someone would offer up the 'take the bus..' thing :roll:
guess there really is no way to make this heavy car more fuel efficient than to gently roll out at all times and the other 'smart' stuff...
damn premium fuel is soo $$ now too dammit!!! :pissed:
Few buses surpass the efficiency of the IS, besides I sold the bus. :lol:
 

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i was getting about 400 miles per tank before the turbo...drive easy and get a grounding kit. I was using 94 octane.
 

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Discussion Starter · #14 ·
does the Grounding Kit make that much of a difference? What's a good make to get for our cars?
 

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brc said:
does the Grounding Kit make that much of a difference? What's a good make to get for our cars?
There is only 1 make.
You do get a color choice, though.
Do not expect any noticeable gains in gas mileage.

Only trasnsmission swap will be an effective way to increase gas mileage
 

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try turning off the A/C when you drive. Because of the oppressive humidity here, i usually have the A/C on whenever I am in the car whether it is summer or winter. I read somewhere that on a hot summer day, the A/C could reduce your mileage by as much as 3-4 mpg.
 

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Always drive downhill.
I seem to get the same gas mileage no matter what except for my trips to Vegas. I mean it always gets around 298 miles before that light cums on.
 

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turn on the snow mode. I've gotten around a 100 mile increase...
 
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