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Old 04-07-2006, 01:33 PM   #1
Kurby88
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gas milage

ive been reading up alot on this and it seems my gas isnt that bad (23-24ish city) i have a '01 zx3 with 83k miles, no mods to my knowleage (i got it used at 74k miles maybe?) anyway when i got it it got a new water pump and new carobator and maybe one other thing, is there anything else i can do to help out my gas milage, i change the oil every 3kmiles (or there around) and so i guess, is there any cheap mods or anything like that i can do, and is there anything i should check to make sure it is still working right in the engine.


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Old 04-07-2006, 02:02 PM   #2
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Air in and Air Out is going to be the biggest, but it's not 'cheap'. You can try to give your tires more air, but not too much. Less tire touchin the ground less power it takes to get move and stay movin. Change your Air Filter to a K&N OEM Replacement or a cleaner Air Filter. And Watch the right foot.

You can get a different intake, such as a AEM Shortram for under $100, it'll free up some Horsepower and give you better MPG IF YOU CAN KEEP OFF THE RIGHT FOOT. Cat-back Exhaust will help as well, and the cheapest cat-back there is MBRP is roughly $250 give or take including shipping. You'll see a increase in MPG as long as you KEEP OFF THE RIGHT FOOT.

The biggest factor is going to be the right foot and driving style. Obviously you'll get better MPG on the highway compared to the city, but driving style plays another big part in it.
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Old 04-07-2006, 02:21 PM   #3
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yeah, when i first got my car i was getting about 18-20 :( haha, but now that i have been driving for about 8 months (man i am so young) i9 feel i have matured alot and i dont really put much gas in anymore, i jsut barly tap the petal. i do pritty much only city driving, i just filled up and had 10.673 gallons and 289 miles (a little highway going to a soccer game, maybe 30 miles total) so its not that i am doing that bad, i just was wondering if there is anything cheap i could do. i have low profile tires that i put 32 psi in the fronyt and 30 int eh back i think? if you think i should do anything different let me know. yes, i do drive a 5 speed, when do you think i should shift, i tend to shift at 20 30 40 55 (i have noticed 5th grear has a hudge drop off compared to the other gears, i guess for better highway milage). anyway, those speeds are between 3500 and 4000 rms ive noticed, it just feels like the time to shift, tends to give me enough power in the next gear, i also downshift alot to slow down, is this a bad idea? (shouldnt affect gas i know, but is it stupid to do?)
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Old 04-07-2006, 03:21 PM   #4
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I would look at how much air pressure you can put into your tires cold. On my Goodyear Assurance Tires, it says the max is 45 PSI, so i put in 40 PSI. That's when i got my best mileage at 37 MPG 90% highway with 3 other people in the car going to a wedding with 2 days worth of clothes and some gifts in the car. I'm also slightly modded, so that could make a difference. Now with 40 PSI in the tires, i feel a lot of bumps and groves in the road, but it makes me feel like i'm closer to the road and helps me pay attention to what i'm doing.
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Old 04-09-2006, 02:16 AM   #5
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engine braking is very bad for gas milage
think of rpms at idle, when you brake with the pedal only
the clutch is not engaged, so engine idles
with engine braking you have the engine at HIGH rpms
higher rpms = more gas
simple, that's what brakes are for, far cheaper and easier to replace than a clutch and less wear for the tranny as well....
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Old 04-09-2006, 09:47 AM   #6
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So untrue about engine braking. There is no fuel needed to keep the engine running when engine braking. Idling uses more fuel.
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Old 04-09-2006, 11:42 AM   #7
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so when it's spinning at higher rpms it's not using fuel at all?
the few times I do it, I match rpms which requires revving the engine
I still dont' see how an engine at 3500+ rpms is using less gas
than idling at less than 800....
oh well, either way I prefer using the actual brakes
over the engine
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Old 04-09-2006, 04:25 PM   #8
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Quote:
Originally posted by HuD 91gt
So untrue about engine braking. There is no fuel needed to keep the engine running when engine braking. Idling uses more fuel.
kyllgore is correct. the fuel mixture is determined by throttle position and rpm. therefore if the throttle position is the same for idling and engine braking then the rpm's would determine the mixture.

lildisco, be careful with running to much air in the tires. its horrible for handling and causes the tires to wear improperly.
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Old 04-10-2006, 07:01 AM   #9
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Quote:
Originally posted by fallacious_focus
lildisco, be careful with running to much air in the tires. its horrible for handling and causes the tires to wear improperly.
These actually handle better and grab more with more air in them. Max cold PSI is 45, i feel safe having them at 40 cold PSI
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Old 04-10-2006, 12:17 PM   #10
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30 on the city, w/my ZX3 01, 80kmiles on it
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