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SPI Performance (2000-2004) The place to chat about any 2.0L Split Port Injection engine performance, tuning and exhaust related upgrades.

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Old 03-21-2004, 09:01 PM   #1
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Poor gas mileage

My gas mileage sucks a$$! I dont know what wrong. I can fill it up drive for ten minutes then have have half a tank left. I dont see any leeks. I have a 2001 spi


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Old 03-21-2004, 11:54 PM   #2
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check your tires for pressire, change air filter, and dont pick up any fat chicks.

that should about do it
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Old 03-22-2004, 09:05 AM   #3
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I feel like I have bad gas mileage too. Well my mods are a magnaflow exhaust, bosch platinum spark plugs, and a drop in K&N. I dunno if these things make it burn fuel at a higher rate. I also do a lot of highway driving. Do you?
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Old 03-31-2004, 09:07 PM   #4
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it seems dat wit my intake and exhaust, my spi burns da same amount of gas as when it was stock........i guess mines is special, it's pretty good on gas.........!
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Old 03-31-2004, 09:20 PM   #5
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no performance mods?

you might want to get that checked out. do you do a lot of idling? do you drive like a maniac? do you rev your car alot?

i get about 35-36 mpg in my spi, mostly 65mph highway driving with no performance mods.
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Old 03-31-2004, 09:54 PM   #6
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Ever since i got my 02 SE, It has always had excellent GM. Even with my intake and stock exhaust, it still gets good mileage. I'm pretty hard on it to. I geuss put some injector cleaner iin it to clear the injectors maybe. They shouldn't be clogged or anything being that it is fairly new and not an 85 datsun with 100,000 miles on it. I really can't think of what it could be. Get it checked!!!!!!!!
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Old 04-01-2004, 08:42 PM   #7
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There have been a few instances of the fuel pump going out and the fuel level being incorrectly relayed. Is this it or are you really burning the fuel at that rate? I popped a fuel injector off once (my fault) and pumped out about 1/4 tank on the ground. I can't believe she didn't blow up that day......
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Old 04-02-2004, 08:51 AM   #8
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I get low 40s per gallon with my SPI. Better intake and exhaust don't help you burn too much more that I'm aware of.
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Old 04-05-2004, 06:48 PM   #9
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my mileage went up after I dropped the K&N drop in. I get avg about 33-36mpg on mine on the highway doing about 80mph on I-5 going up and down the state.

Last year before i put the K&N in I needed 2 tanks to get to Sacramento from LA (about 370 miles door to door). I put it in and I can now make it on one tank (okay i do hit reserve but its doable).

Make sure you keep your air pressure up in the right area and also make sure your intake and injectors are clean.
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Old 04-05-2004, 07:08 PM   #10
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I have noticed that with my fuel economy, driving style plays a HUGE role. My girlfriend lives about an hour away from me, and at 80 mph it takes a little over a quarter tank to make the trip. Buy if I drive 65 mph, it takes 1/16 to 1/8 af a tank less to get there. One of the main reasons I bought my Focus was the gas mileage.

As an aside, another thing I've noticed is that when I have a full tank, it seems to deplete faster untill it gets to a half tank then the cunsumption seems to drop. Has anyone else noticed this? Could it be the added weight of the fuel, and as it burns up the car gets lighter and therefore more fuel effecient?
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