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Old 09-20-2012, 07:44 PM   #1
1hotfocus
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Mpg woes

Its been getting more expensive, as I've been getting the gas mileage of a v6 averaging 18-21 mpg at best. Yes I'm calculating it right and have been for a year and never have seen better. (Fill up, reset trip meter, fill up when gas lights on, divide mileage on trip by gallons it filled up with.) I've been in search for a whole year and nothing is helping. If I drive like a Granny gets me 21 best. Spiritual I get 18-19.

Car runs smooth. Things I've done within a year:
Aligned to exact settings that were posted by geezer and stickied.
Fuel filter.
Spark plugs/wires coil
Timing belt
Cold air intake (clean/oil filter every 10k)
PVC valve
Maf sensor cleaned with Maf cleaner
Full Castrol synthetic 5w20 every 5-7k
Techron fuel injector cleaner (tried once)
Lucas gas additives (tried once)
Some slight weight reduction (spare, rear bench seat)
I drive usually 6% high way 40% city
New set of tires (35 psi cold)

Car idles smooth, runs strong, and power is the way it should be. It seems to run slight rich when starting up for 5-10 seconds after starting (smells like gas but quickly disperses) don't known if there's a linkage to this to my poor mpg.. there's no fuel leaks of any kind.

Car has only 32,000 and a sohc atx. Compression is also good in all 4 cylinders.

Fuel injectors do tick. (Also don't think this affects mpg)

Don't know what else to do? Thank you.

Id love to average 24 mpg.


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Old 09-20-2012, 09:58 PM   #2
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I get 18mpg in the SVT all the time, I guess we do most local driving so thats the point
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Old 09-21-2012, 04:01 AM   #3
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my 2.3L gets like 17 mpg, 170 miles per tank.. 10.5 gallons to refill on average.
however my 2.0L gets 270 per tank
330 miles if I watch it
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Old 09-21-2012, 05:20 AM   #4
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32k miles over 12 years? How long does it take you to go through a tank of gas in days or weeks?

How far is your drive in miles? Time running the engine?

Does the fuel cap hiss at you or woosh when you remove it?
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Old 09-21-2012, 06:06 AM   #5
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What rpm are you turning at a steady 60mph?
And are you running the AC/defrost at all?
Has the fuel pump been replaced?
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Old 09-21-2012, 10:51 AM   #6
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yea 32k, the car wasnt driven much from 06-08 but was driven once a week for a few miles. i average about 7-8k a year now driving for the past two years so at fillup now it only lasts me about 10-12 days till gas light comes on.

i drive about 130-150 miles a week, 60% highway 40% city now. fuel cap makes no noise when being removed, or at all. i have no rpm gauge, however at arund 55-60 id say 2.5k-3.2k ish. i may try and do the rpm test on the trip meter and see where im at
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Old 09-21-2012, 11:01 AM   #7
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OEM tires are made just to save gas, so a wider tire, more meat on it will loose 1 or 2 mpg and a CAI can let your motor breath better, but has the tendency to use more fuel since you may jackrabbit more
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Old 09-22-2012, 12:08 AM   #8
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What rpm are you turning at a steady 60mph?
And are you running the AC/defrost at all?
Has the fuel pump been replaced?
Checked today, 2250-3000 rpm while at 60 and slightly on the gas (no cruise control) and I barely run a/c or defrost. I don't drive with Windows down either on highway.

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Old 09-22-2012, 11:26 AM   #9
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I'm getting around 23 mpg average in my 05 ST 2.3L MT. It's got around 95,000 miles. I use factory plugs at the factory gap. I tried other suggestions with plugs and gaps but lost mpgs. I have a stealth CAI. My biggest thing is keeping the tires at the proper psi. MPG seems to drop significantly when the psi drops and I have to check them everytime I fuel. I think the stems are maybe leaking and have to get them checked sometime.
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Old 09-22-2012, 12:10 PM   #10
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I think the stems are maybe leaking and have to get them checked sometime.
Seriously, this one right here.



When looking for portable 12v air compressors, I recommend only Interdynamics products. I've owned 3 in 20 years. I lost one to loaning out, and the other one to my dad, and there's the one I have now. They make higher priced models like this one ($40) and more compact low priced ones ($20). This is an American company, and all the ones I bought were made in the USA. These are the people who invented the 12v tire pump compressor. The small ones will take longer to pump up a tire. The one I recommended will pump up one of our tires from 10 psi to 35 in 3-5 mins, and has a 15' long cord.

You have a Duratec engine, and this guy has an SPI. There are vast differences. If you want my recommendations on fuel economy PM me, but I'm not going to thread jack any more.
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