performance and gas mileage - Scion xB Forum
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#1 Old 10-26-2007, 02:02 PM
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performance and gas mileage

i've noticed recently that i havent been getting very good gas mileage. i do have 18's but i used to get better gas mileage and i noticed that my car runs alittle sluggish. i have about 50k on it, any ideas.

Aerodynamics are overrated
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#2 Old 10-26-2007, 04:45 PM
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Re: performance and gas mileage

sluggish as in acceleration?...highway speed?...need to be alittle more specific...

there old addage is the following:
common everyday cars are built for
1. economy
2. reliability
3. no perforamance

when doing any change to a car, including adding wheels you will alter one of the 3 things listed above...plain and simple...

the more you change, the more you are subject to seriously alter one of the 3...

rule of thumb is, if you want one of those 3 to change, expect to only have 1 or possably 2 of the above things to survive...

if you want performance, then expect reliability to diminish along with economy...

if you add tires, expect economy to diminish...thats why all those mitsu freaks and honda and subaru freaks do all those mods...and simply destory the car they have...and then they complain about it...lol...sorry, but its the way things go when changing things out...

WHO NEEDS SPEED IN AN XB???...I GOTZ MY CROTCH ROCKET!!!!
THERE IS NO "I" IN "TEAM",BUT THERE IS "ME"
"...plus my gf was with me saying "omg slow down, slow down" and I was thinking "Lose annoying squalk box in passenger seat, afford more mods and have less weight in the car and on the back of the bike"
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#3 Old 10-26-2007, 05:08 PM
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Re: performance and gas mileage

i'm having the same issue so i put my stock wheels back on and the mileage is bout the same as having my 18s on. i'm roughly getting 300 miles to the tank with mild mods (exhaust, cai, ground kit). i think it all boils down to how heavy footed you are. the only way i save more gas is if i drive the speed limit. as far as how many miles are on the car i'm around 28,000
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#4 Old 10-30-2007, 12:00 PM
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Re: performance and gas mileage

it seems a little sluggish on the take off, and also if i'm at a dead stop, while in drive gear (auto) my car sometimes shakes a little. if i put it in neutral it goes away. what could that be.

Aerodynamics are overrated
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#5 Old 10-30-2007, 03:43 PM
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Re: performance and gas mileage

Quote:
Originally Posted by respect_the_box View Post
it seems a little sluggish on the take off, and also if i'm at a dead stop, while in drive gear (auto) my car sometimes shakes a little. if i put it in neutral it goes away. what could that be.
I get the shakes at the light in mine also. The tach looks about 500 to 700. neutral helps. A more flow exhaust helped. I figure it's' just a low idle setting.
Or it just doesn't like standing still!
I like the lower front bumper protection you show in the picture of your ride will you let me know where to got . Im' looking to get ready for winter.

Which makes my wonder what everyone does up north to protect the xB from the elements.

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#6 Old 10-30-2007, 03:52 PM
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Re: performance and gas mileage

Did you say that you had an intake? If you do, that may be why your car shakes, i have an intake an it shakes alll the time and with the auto transmission putting it in drive already lowers the RPMs which may cause your car to sound like it might stall although it wont.

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#7 Old 10-30-2007, 04:03 PM
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Re: performance and gas mileage

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Originally Posted by bBaction View Post
Did you say that you had an intake? If you do, that may be why your car shakes, i have an intake an it shakes alll the time and with the auto transmission putting it in drive already lowers the RPMs which may cause your car to sound like it might stall although it wont.
Yes, your right. I do have a CAI ( TRD) and it has never stalled.
I kind of like it.
When someone new to the xB gets in it I tell'em to "tighten that seat belt she wants to rock!"

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#8 Old 10-30-2007, 04:10 PM
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Re: performance and gas mileage

Quote:
Originally Posted by respect_the_box View Post
i've noticed recently that i havent been getting very good gas mileage. i do have 18's but i used to get better gas mileage and i noticed that my car runs alittle sluggish. i have about 50k on it, any ideas.
id say get your transmission flushed or serviced in some way.

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When you get your car back from em, they would be all..."and we installed a blender in the back so you can make smooties all day now!"
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#9 Old 10-30-2007, 04:19 PM
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Re: performance and gas mileage

i added a SRI to mine and improved gas mileage, but put different tires and it's gone back down. so what has been said is true.

2002 Ford Focus SE

I will own a 1st gen xB again one day!
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#10 Old 11-08-2007, 11:35 AM
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Re: performance and gas mileage

Quote:
Originally Posted by respect_the_box View Post
it seems a little sluggish on the take off, and also if i'm at a dead stop, while in drive gear (auto) my car sometimes shakes a little. if i put it in neutral it goes away. what could that be.
Hey guys I just had that problem solved. It took me abusing it when it was acting funny, it was the air control valve ?IAC? I went to the dealer a couple of times and it had not coded but the last time it did and they replaced it and all is good no more idling down to 500+/- rpm and no more lag to nothing on hard acceleration. Spread the word and get it replaced while it is still under warranty. I am at 28kmls.
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#11 Old 11-08-2007, 12:53 PM
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Re: performance and gas mileage

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Originally Posted by lilblakbox View Post
Hey guys I just had that problem solved. It took me abusing it when it was acting funny, it was the air control valve ?IAC? I went to the dealer a couple of times and it had not coded but the last time it did and they replaced it and all is good no more idling down to 500+/- rpm and no more lag to nothing on hard acceleration. Spread the word and get it replaced while it is still under warranty. I am at 28kmls.
I got to check this out.
They didn't just turn up the idle?
Was anything else done to the car at the time Air Control Valve was replaced?
What's a IAC? Something Air Control

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#12 Old 11-08-2007, 07:34 PM
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Re: performance and gas mileage

Quote:
Originally Posted by BigT View Post
I got to check this out.
They didn't just turn up the idle?
Was anything else done to the car at the time Air Control Valve was replaced?
What's a IAC? Something Air Control
Yea I would have to say so. They did not just raise the idle, that would be obnoxiously obvious. I went into the bay to check on the cars progress they had to remove the top part of my TRD intake to get to the part they replaced. The issues with the odd low idling and the come and go lack of acceleration are gone it's back to good old 110hp of FURY~! Look out Geo's everywhere.
Oh and they did not replace anything else, and the name was air control valve but they had an acronym that was something like IAC.

Last edited by lilblakbox; 11-08-2007 at 07:37 PM.
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