for some reason my car gets horrible gas milage

it seems like when i eccelerate at normal rate you can see the gas hand drop slowly then slowly go back up

what can that be.

 

gas moving around in the tank... IE if u went up and down sharp hills you would see it big time.. its normal

 

oh didnt eventhink of that good lookin out man.
do you have any suggestions on spark plugs, wires, caps, and rotor.

 

to help mpg i usally change the spark plugs and o2 sensor.. cap, rotor people say change it but im lazy.. usally just how u drive will help.. IE when do you shift at 5k or at 3k

 

yea it does depend highly on how you drive... there are so many things... from keeping up with maintenance to tire pressures.. i shift around 2-2.5K a lot, sometimes ill take it to 3, rarely more than 3K and im getting 32MPG in the city. I'm also planning on building and installing an HHO kit in the near future. My friends moms ex-boyfriend has an inline 6-cyl jeep running around at high 50's MPG with the HHO kit..

 

For spark plugs I think I used Denso, but whatever you do, do not buy Bosch they are crap! As for better mpg, I try to drive like a grandma, but I do have to hit vtec a couple of times to keep things exciting. I have my tire pressure at 40 psi, trying changing you air filter aswell, cap, rotor, and wires, and maybe fuel filter. I getting 35 mpg combined in my D16z6. Good luck man!

 

Your fuel needle shouldn't bounce and forth that much, no matter how hard you accelerate. You could see a dip in cornering, but you shouldn't notice a deflection in linear driving.

Maybe knowing what was done to your car could help explain why your mileage sucks..? Everybody keeps saying shift lower, shift lower. BS. If you're mashing the throttle 50% and shifting at 2500 then your mileage will still blow. If you shift at 5000 with lighter throttle 20%, then that will be better. Mashing the throttle will greatly increase the air volume so the ECU has to proportionately increase the fuel volume.

To note, I got 33 mpg on my last tank... B18C in an EJ8.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by maal15 &raquo;</TD></TR><TR><TD CLASS="quote">for some reason my car gets horrible gas milage.</TD></TR></TABLE>


Heh!

I gotta be king of "Si Gas Mileage"

B16A2-EJ7:

5/16/08 - 353.7 miles / 9.349 gallons = 37.9 MPG
5/21/08 - 373.0 miles / 9.630 gallons = 38.7 MPG
5/27/08 - 383.8 miles / 9.337 gallons = 41.1 MPG
6/03/08 - 409.4 miles / 9.876 gallons = 41.5 MPG
6/07/08 - 366.1 miles / 8.679 gallons = 42.2 MPG
6/16/08 - 344.8 miles / 9.051 gallons = 37.8 MPG
6/23/06 - 450.8 miles / 10.62 gallons = 42.5 MPG

You can click on my 'nick' to the see the car, but...

Basically it's a HX shell with a full Si swap - HX rims with Pirelli tires @ 45 PSI - Mobil 1 10W/30 motor oil - Redline MT-90 tranny fluid - Chevron regular unleaded - and don't race ppl more than you have to...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by maal15 &raquo;</TD></TR><TR><TD CLASS="quote">do you have any suggestions on spark plugs...</TD></TR></TABLE>


Personally, I prefer copper-core plugs!

They work the best, but you gotta change 'em out more often - 15K is about right in my experience...

My pick: Champion Copper Plus RC12MC4

 

Why would anyone change an 02 sensor as maintenance?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by marcs1337 &raquo;</TD></TR><TR><TD CLASS="quote">Why would anyone change an 02 sensor as maintenance?
</TD></TR></TABLE>

because an older O2 may provide more erroneous or inaccurate readings, which in turn cause the ECU to compensate on its fuel delivery that could adversely affect efficiency.

 

yea what mods are done to the car? i used to have a header on my car and i was getting HORRIBLE mileage...i mean i was gettin like 150miles to a tank! i put new plugs, cap, rotor, fule filter, o2sensor and was still gettin between 150-170 a tank..put stock header back on and now im bout the average...gotta keep my foot out the throttle though, lol.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackDeuceCoupe &raquo;</TD></TR><TR><TD CLASS="quote">


Heh!

I gotta be king of "Si Gas Mileage"

B16A2-EJ7:

5/16/08 - 353.7 miles / 9.349 gallons = 37.9 MPG
5/21/08 - 373.0 miles / 9.630 gallons = 38.7 MPG
5/27/08 - 383.8 miles / 9.337 gallons = 41.1 MPG
6/03/08 - 409.4 miles / 9.876 gallons = 41.5 MPG
6/07/08 - 366.1 miles / 8.679 gallons = 42.2 MPG
6/16/08 - 344.8 miles / 9.051 gallons = 37.8 MPG
6/23/06 - 450.8 miles / 10.62 gallons = 42.5 MPG

You can click on my 'nick' to the see the car, but...

Basically it's a HX shell with a full Si swap - HX rims with Pirelli tires @ 45 PSI - Mobil 1 10W/30 motor oil - Redline MT-90 tranny fluid - Chevron regular unleaded - and don't race ppl more than you have to...
</TD></TR></TABLE>

b16's call for 91 octane don't they?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lmananT &raquo;</TD></TR><TR><TD CLASS="quote">b16's call for 91 octane don't they?</TD></TR></TABLE>


Yeah, but, doing a little seat-of-the-pants testing...

I've discovered that I can get away with regular unleaded, as long as I use certified Top Tier gas (Chevron, Shell, Texaco, et cetera).

Non-Top Tier regular gas (everyone else) runs like *** in my b16! Kinda schizo...

Gas mileage is about the same, either way, but...

My b16 actually starts, idles and runs better with Chevron regular than non-Top Tier premium unleaded!

 

the fuel gagues just suck in civic's i had a 2000 ex and when i would ride around for instance it would say it had half a tank
i would like park the car over night and the next morning it would say it had a quarter tank my buddys 2000 si did the same ****

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dkober101 &raquo;</TD></TR><TR><TD CLASS="quote">the fuel gagues just suck in civic's...</TD></TR></TABLE>


True!

The best method is to top off your tank at fill up, use the 'trip meter', and (more or less) ignore the gas gauge...

With my 2000 D16 HX I had to start looking for gas @ around 400-425 miles - give or take.

With my 1998 B16 HX its 350-400 miles...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bmorei9s08 &raquo;</TD></TR><TR><TD CLASS="quote">yea what mods are done to the car? i used to have a header on my car and i was getting HORRIBLE mileage...i mean i was gettin like 150miles to a tank! i put new plugs, cap, rotor, fule filter, o2sensor and was still gettin between 150-170 a tank..put stock header back on and now im bout the average...gotta keep my foot out the throttle though, lol.</TD></TR></TABLE>

the only way a header will do that kind of damage is if you had a primary O2 in it and it was being blocked from reading any sort of exhaust gas. no effin way otherwise.