[tite681]

Is there anything out there you can bolt on that claims better gas mileage for the Si? I read or misread something that says a throttle body spacer helps. Also, I read a short debate that X's Intake can increase gas mileage as well.

 

[twistedframe]

I have noticed an increase in gas mileage after I installed the TBS, but I have no other corroborating data. Just the info I collected. I think on my 1st tank after the install I gain 1.5-2mpg than on my previous three tanks. Hope this helps.

 

[shutter13]

k&n drop in filter will most definitely improve mileage

 

[KidnKorner]

Any modification that reduces the restriction of air flow in AND out of your motor will improve fuel economy, so long as you drive reasonably.


Other modifications that can potentially improve fuel economy.

• 
  Chromoly flywheel
  
  Forged wheels
  
  Synthetic fluids
  
  Narrower tires

Skip shifting (1, 3, 5, 6) can help improve fuel economy also.

 

[8civic]

Weight reduction helps with fuel economy. Lightweight wheels, carbon fiber panels, and removing unnecessary stuff helps. Weight reduction in the rotating assembly helps as well. I noticed 1 or 2 better MPG with my NST pulley kit so I would recommend those.

 

[Holland]

the DCRH gave me a few more mpg...

 

[SPARTANER]

Weight reduction for me = not wearing underwear. You get the performance of a lighter car and the benefit of getting rid of those pesky pantie lines.

 

[Jardiniboy]

The driver is the biggest mod to change for better gas mileage.

 

[caveman74]

I just got 360 out of my tank. I had ONE bar left. All mixed driving.

 

[Tastycakes]

Either dont use the defroster or defrost/feet alot cause the ac compressor cycles on and off when you do or you can do the mod so you can manually turn the ac off. But you will still have to occasionally turn the ac on to clear fog cause just air by itself wont really clear it.

 

[twistedframe]

Any modification that reduces the restriction of air flow in AND out of your motor will improve fuel economy, so long as you drive reasonably.


Other modifications that can potentially improve fuel economy.

• 
  Chromoly flywheel
  
  Forged wheels
  
  Synthetic fluids
  
  Narrower tires

Skip shifting (1, 3, 5, 6) can help improve fuel economy also.

If you are going to skip gears, make sure you let the revs come down enough to match the gear you are going into. Otherwise you are going to put strain on your syncros.

Weight reduction helps with fuel economy. Lightweight wheels, carbon fiber panels, and removing unnecessary stuff helps. Weight reduction in the rotating assembly helps as well. I noticed 1 or 2 better MPG with my NST pulley kit so I would recommend those.

I like the idea of a pulley kit, but weight reduction like that seems a little extreme for a street car to me.

Weight reduction for me = not wearing underwear. You get the performance of a lighter car and the benefit of getting rid of those pesky pantie lines.

:rotfl:

The driver is the biggest mod to change for better gas mileage.

:thumb: I totally agree. When I don't drive like a jackass, thats when I see the most improvement in gas mileage.

I just got 360 out of my tank. I had ONE bar left. All mixed driving.

:thumb: Thats really good!

 

[SiConvert887]

To summ up... looks like so far:

TBS
Intake (I think X intake would be best for mileage because of his AFRs)
Sub in drop in filter for intake
2.5" Headers back Exhaust
Lightweight pulleys
Lightweight Wheels
and possible carbonfiber body panelling...?
use a/c less

I can attest that I installed the TBS/K&N drop in and switched from mid-grade to premium and STILL saw an increase in gas mileage. Its most def noticeable! :thumb:

quick question for you guys, I like to leave the car in defrost when the fans aren't on because (at least for me) when I drive, especially at highway speeds, my vents are circulating air and its most convenient for me when its not on my face... does that still trigger the a/c compressor..? i'de hope not but you never know...