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Old 05-23-2006, 07:57 PM   #1
Kokojura
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Default MPG improve/worsen with age?

quick question for those that have had their cars for several years and pay attention to the mpg. i've heard it said that fuel efficiency improves after about 5-10k. in your experience, is this true?
thanks
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Old 05-23-2006, 08:10 PM   #2
Impresario
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yes, mpg tends to improve after the 1st 5000 miles.
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Old 05-23-2006, 08:14 PM   #3
Bishop
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Quote:
Originally Posted by Impresario
yes, mpg tends to improve after the 1st 5000 miles.
and will decrease once you start addin mods!! your f00t gets heavier!
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Old 05-23-2006, 08:14 PM   #4
AWD>FWD
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How come?
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Old 05-23-2006, 08:15 PM   #5
iamtherealwoody
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did for me, I got 240 miles to the tank at best when my 05 wrx was new, now i got 41k on it and get an easy 280, but more like 300 miles to tank. I even sometimes get 320 or more with mixed city/highway driving. It will get better.
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Old 05-23-2006, 08:19 PM   #6
daviro2
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after my second oil change (6k) the MPG jumped up to where it should be....around 23......nice!!!!
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Old 05-23-2006, 08:21 PM   #7
taedaug
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^^^same here!!
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Old 05-23-2006, 08:39 PM   #8
MrPhiscal
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Ok Here is why. When a motor is new the pistons rings have not been full seated(they come a little to big) . The when they do get seated( they get grinded against the block) they make a great seal. Then after a while HEAT swells the Block and the grinding starts to cut away the metal of those same rings and you LOSE MPG and power . That why they give you a whole list of things NOT to do to a new Car..1-Don't drive a same spped for to long 2 Warm it up for five mins . Things like that . I HOPE you listened
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Old 05-23-2006, 08:59 PM   #9
AWD>FWD
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I still baby my car, so I listened to them.
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Old 05-24-2006, 12:37 AM   #10
Kokojura
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good to know. i've been getting about 240 a tank, which is 15mpg in city driving (an absolute minimum according to the manufacturer). thanks for the replies.
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Old 05-24-2006, 12:43 AM   #11
airprakken
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Quote:
Originally Posted by Kokojura
good to know. i've been getting about 240 a tank, which is 15mpg in city driving (an absolute minimum according to the manufacturer). thanks for the replies.
Do you ever actually divide the miles between two fillups by the gallons of the second fillup? This "miles per tank" thing is extremely imprecise.

The worst I have ever seen is about 18 with LOTS of low gear, high RPM driving.
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Old 05-24-2006, 01:16 AM   #12
WRXDriftR
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my mileage improved from Stock to cobb stage1, and then cobb stage2. you use much less peddle pushing to move the car the same. Fun sprints help bring it back down though
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Old 05-24-2006, 01:31 AM   #13
desert pirate
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26-7mpg highway ~84 mph
with 95k on the odometer
stage 2 OTS map
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Old 05-24-2006, 04:17 AM   #14
djdimensions
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Quote:
Originally Posted by iamtherealwoody
did for me, I got 240 miles to the tank at best when my 05 wrx was new, now i got 41k on it and get an easy 280, but more like 300 miles to tank. I even sometimes get 320 or more with mixed city/highway driving. It will get better.
i get about 340 almost all the time.240 wow thats nothing
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Old 05-24-2006, 04:44 AM   #15
Bishop
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i'm at roughly 26mpg highway@80mph
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Old 05-24-2006, 01:46 PM   #16
Kokojura
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Quote:
Originally Posted by airprakken
Do you ever actually divide the miles between two fillups by the gallons of the second fillup? This "miles per tank" thing is extremely imprecise.

The worst I have ever seen is about 18 with LOTS of low gear, high RPM driving.
that is what i do; i don't see any other way to do it though...this is simple math.
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Old 05-24-2006, 03:33 PM   #17
rick-l
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You be the judge. New 2003 WRX 3/11/2003 current milleage 64,xxx. Pretty linear increase in mileage (same miles per day). I live in St Louis where we have seasonally adjusted fuel formulations. About 2700 gallons of gas. since new it has averaged 23.43 mpg.
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Old 05-24-2006, 06:23 PM   #18
Naito
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THAt has got to be the most detailed record of mileage I have EVER seen. WOW!
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Old 05-25-2006, 12:48 PM   #19
rick-l
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I guess you wanted MPG vs. mileage.

I did this because I thought it would be a good maintenance indicator. Aside from making me wonder why the mpg has fallen off since 40,000, it tells me nothing.

p.s. An 8 point moving average filter plot is almost as jagged as the original.

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Old 05-25-2006, 01:16 PM   #20
Vacca Rabite
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It gets better as the engine wears in. I got better mileage after 10K miles then I did at 1K, and I am getting slightly better mileage at 45K miles (now) then I was at 10K miles.

Averaging 27-28 mpg - almost all highway commuting.

Zach
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