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01-09-2018, 01:05 PM | #1 |
Scooby Newbie
Member#: 477731
Join Date: Nov 2017
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Cold start fuel consumption
Long story short I got gas last night, drove one mile home after clearing the trip odometer, and got 20.1 mpg. This morning during a cold start I went from 20.1 down to 9.6 mpg before it warmed up.
I've always felt that the mpg was a little low in my WRX, but is that normal for a cold start to use that much gas? 2014 WRX, Invidia Catted DP, R400 Catback, Stage 2 OTS map
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01-09-2018, 01:09 PM | #2 |
Scooby Newbie
Member#: 348882
Join Date: Mar 2013
Chapter/Region:
MWSOC
Location: Royal Oak, MI
Vehicle:2012 WRX Hatch WRB |
I assume you probably filled up, reset your odometer and maybe put on 25mi since fill up. With that little miles a cold start will consume a lot of gas hence the number you saw. You probably let it warm up without driving as well I assume which means no mi's driven and lots of gas burned. Wouldn't think anything of it; it's a cold start and that turbo needs to warm up.
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01-09-2018, 01:16 PM | #3 |
NASIOC Supporter
Member#: 30669
Join Date: Dec 2002
Chapter/Region:
Tri-State
Location: USA, North NJ, 07456
Vehicle:1998 Legacy 2.5GT Silver Sleeper BK, 5MT |
To figure MPG, best bet is most of a tank based on "your normal driving". Checking after a fill and doing a track day WILL kill MPG.
Doing a long steady state highway run at "reasonable" speeds will help MPG. Goal is to check tank to tank for normal driving. Ignore the dash gauge (if you have one.....), divide miles driven by gallons put in, smooth the avarage over time. A consistent drop could be worn plugs, low tire pressure, dragging brake. Look to long term, not a few miles. Some parts of the country, we get different fuel between summer and winter, that makes a difference as well. Take this from someone that has logged (on paper) many things in over 40 years.... |
01-09-2018, 01:52 PM | #4 |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
yes, normal.
That's why engines want to warm up as quickly as possible. |
01-09-2018, 02:48 PM | #5 |
Scooby Specialist
Member#: 298403
Join Date: Oct 2011
Chapter/Region:
W. Canada
Vehicle:2008 WRX Premium Spark Silver |
I'm sure many will have opinions on this but during colder temps (winter) you car really only needs to be running about 1-3 minutes on cold start before you can start driving. Anything longer and it's just personal preference (I.E.: don't want to drive a cold car). Drive with a light foot until it gets warmer (say, 1/4 way warmed up). Engine will warm up sooner and reduce needless idling wear on your engine, and you will save all that fuel for actually moving the vehicle instead of parked and idling.
Of course, block heaters are a good investment or if you have a heated garage, sell all your crap and park in there. The computer calculates fuel used vs distance driven. So if you've done a fair bit of accelerating during your fillup to home, you'll always use more fuel accelerating than cruising so the computer reflected that. Less miles driven means less of an average the computer has to calculate. |
01-09-2018, 03:33 PM | #6 | |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
Quote:
no way I'm sitting in there for several minutes freezing If I start driving I swear the heat starts working within a minute in this car. By far the fastest warming up car I've ever had (interior heater I mean) |
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01-09-2018, 03:41 PM | #7 |
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01-09-2018, 04:28 PM | #8 |
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01-09-2018, 04:33 PM | #9 |
Scooby Specialist
Member#: 298403
Join Date: Oct 2011
Chapter/Region:
W. Canada
Vehicle:2008 WRX Premium Spark Silver |
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01-09-2018, 05:59 PM | #10 |
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You do realize winter gas is different then summer gas, winter gas gives lower mpg's.
I also don't let my cars warm up in the driveway, start it and drive it. It warm's up faster. |
01-17-2018, 03:32 AM | #11 |
Scooby Newbie
Member#: 477731
Join Date: Nov 2017
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Thanks for all the responses! Just got around to checking this. I do feel that my mpg's are a little low compared to what subaru advertises. I get about 23.5 if I drive 100 miles on the highway at cruising speed with almost no hard acceleration and 17 mpg around town. Supposedly I should be getting 19/25, but I guess I never really do completely stay out of boost when I drive.
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01-17-2018, 07:44 AM | #12 |
Scooby Specialist
Member#: 298403
Join Date: Oct 2011
Chapter/Region:
W. Canada
Vehicle:2008 WRX Premium Spark Silver |
What car manufactured advertised is under perfect conditions, which most people never see.
What your getting seems pretty normal. |
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