Ways to improve gas mileage - Scion XB Forum
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post #1 of 141 (permalink) Old 09-29-2009, 05:12 PM Thread Starter
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Default Ways to improve gas mileage

I know ways to improve gas mileage, but do you guys have any suggestions?

1. Check tire pressures
2. Keep up with regular service maintenance (including filters)
3. Remove unnecessary items from your trunk
4. Let your car get up to speed SMOOTHLY --- do not RACE you engine
5. Run SYNTHETIC OIL in your engine (I read this from oil companies and local retailers)
6. Keep the exterior of you car CLEAN and SMOOTH (I read this from www.chemicalguys.com). Cleaner car will have less drag when its running.

***2009 Scion xB - Black Pearl Sand***- K & N Drop-In Air Filter- 6000K Digital HID (4300K as backup)- Sylvania SilverStar turn signals- GATLING GUN chrome shifter knob- Pennzoil ULTRA 5W-20 w/ Pure One or Toyota OEM oil filter
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post #2 of 141 (permalink) Old 09-29-2009, 08:01 PM
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Default Re: Ways to improve gas mileage

lets all be honest here. When driving a car with the aerodynamics of a house, keeping the exterior clean and smooth isnt going to help the gas milage

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post #3 of 141 (permalink) Old 09-29-2009, 08:46 PM
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Default Re: Ways to improve gas mileage

Drag is something that becomes more significant w/ greater speed.
Up to a point, the overall aerodynamic drag of the design makes the only significant difference. Around 70 or 80 (or so) other smaller stuff comes into play, like windows open/closed, roof racks, and large stuff. Closer to 100-120, small stuff comes into play.
Unless you are running well over 80 on a regular basis, a somewhat dirty exterior isn't that relevant (any aero advantage is too small to matter). It does matter at higher speeds, but I doubt it is significant at speeds I drive.

The biggest factor for mileage is RPMs and how the driver uses them. I drive fairly aggressive, but get decent mileage for my terrain. One advantage is that I drive on steady speed country roads too, so traffic is only an issue w/in towns (but is BAD in the town where my kids have school/daycare). Most of the cruising MPG issue in my area is hills, of which there are a plethora- literally, they are everywhere. Going up them hurts mileage as I don't pick up enough speed (speed limits) to coast up the other side. So, it isn't nearly as good as flatlanders inherently have for mileage.

A much more significant factor right now is all the ethanol fuel companies are putting in their gas. A local report found one station (a Shell) using 40% Ethanol in regular gas. That will cost more mileage than anything my foot does (short of racing my box).

Right now, the most significant factors in fuel economy:
- Fuel composition (moonshine is for drinking and is NOT good for our engines, nor efficient)
- Driver's use of gas/brake pedals
- Terrain (the flatter the more efficient)
- Tire pressure is w/in correct range (not under or over inflated)
- Maintenance, fluids all moving efficiently w/in the engine, tranny, and so forth
- Reduce overall weight in your car/vehicle (if carrying a lot of extra crap, put on level w/ terrain)

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post #4 of 141 (permalink) Old 09-29-2009, 08:59 PM
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Default Re: Ways to improve gas mileage

One more rule:

Under 35 mph (~56 kph), windows down
Over 35 mph, use A/C

This all goes with the whole drag thing as well; The drag, because of the open windows, up to 35mph is going to make less of an impact on mpg than the A/C would. Concordantly, anywhere above 35, the drag is enough that it outweighs the impact made by A/C.

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post #5 of 141 (permalink) Old 10-01-2009, 10:33 PM
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Default Re: Ways to improve gas mileage

I have done a few mods to mine and I get 31 mpg out of it now. I run Mobile 1, tires are aired up to 40-42 psi,smooth acceleration.

09 Scion Xb, hypnotic teal mica,Factory spoiler in rear, Modded stock air box with drop in K&N, silencer is gone.Lowered with tanabedf210s. Pillar tape pulled,blacked out in front inset,custom touches inside. More to come but real subtle.
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post #6 of 141 (permalink) Old 10-06-2009, 01:55 PM Thread Starter
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Default Re: Ways to improve gas mileage

Quote:
Originally Posted by Aljay
...tires are aired up to 40-42 psi,smooth acceleration.
Won't that increase the wear in your suspension, and decrease the life of your tire?

***2009 Scion xB - Black Pearl Sand***- K & N Drop-In Air Filter- 6000K Digital HID (4300K as backup)- Sylvania SilverStar turn signals- GATLING GUN chrome shifter knob- Pennzoil ULTRA 5W-20 w/ Pure One or Toyota OEM oil filter
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post #7 of 141 (permalink) Old 11-22-2009, 01:53 AM
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Default Re: Ways to improve gas mileage

Quote:
Originally Posted by EPHIOS
Quote:
Originally Posted by Aljay
...tires are aired up to 40-42 psi,smooth acceleration.
Won't that increase the wear in your suspension, and decrease the life of your tire?
Nope rotate tires often. I have 20 k on the stock tires. Actually I just about am ready to put the last of the new tires on I have 30k on the rears they are right at the limit.

09 Scion Xb, hypnotic teal mica,Factory spoiler in rear, Modded stock air box with drop in K&N, silencer is gone.Lowered with tanabedf210s. Pillar tape pulled,blacked out in front inset,custom touches inside. More to come but real subtle.
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post #8 of 141 (permalink) Old 11-22-2009, 03:01 PM
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Default Re: Ways to improve gas mileage

I'd say 26-28 is a good enough, not being a leadfoot helps...

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post #9 of 141 (permalink) Old 11-22-2009, 09:35 PM
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Default Re: Ways to improve gas mileage

Quote:
Originally Posted by jrl91789
I'd say 26-28 is a good enough, not being a leadfoot helps...
Tires tell the story mine are perfectly flat all the way across .

09 Scion Xb, hypnotic teal mica,Factory spoiler in rear, Modded stock air box with drop in K&N, silencer is gone.Lowered with tanabedf210s. Pillar tape pulled,blacked out in front inset,custom touches inside. More to come but real subtle.
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post #10 of 141 (permalink) Old 07-01-2010, 09:47 PM
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Default Re: Ways to improve gas mileage

HI buy your gas at the coolest time of the day- the gas is a denser liquid at that time of day--i have seen an increase of as much as 2 mpg by doing that----tony
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