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07-12-2012, 08:59 PM | #1476 | |
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Member#: 299286
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: Upstate NY
Vehicle:2017 Legacy Limited White |
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07-12-2012, 10:33 PM | #1477 | |
Scooby Newbie
Member#: 319990
Join Date: May 2012
Chapter/Region:
TXIC
Location: Austin, TX
Vehicle:2012 Imp Prm 5D CVT Dark Grey Metallic |
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I am aware of the potential risks with topping off. And most if not all manufactures recommend against it, as well as the gas stations themselves. The reasons I do it are for consistent fill points and to extend range and time between visits to the gas station. Just a personal preference. I have topped off for years on several vehicles and never one time has there been an issue. LET ME SAY THIS AGAIN!!! THIS IS MY PERSONAL PREFERENCE! THIS IS NOT A RECOMMENDATION THAT ANYONE HERE SHOULD DO THE SAME!!! |
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07-12-2012, 11:35 PM | #1478 |
Scooby Specialist
Member#: 319157
Join Date: May 2012
Chapter/Region:
MAIC
Vehicle:2012 Impreza 4DR 5MT |
What does consistent fill points have to do with it? Does the receipt not show you to the thousandth of a gallon what you pumped in?
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07-13-2012, 09:19 AM | #1479 | |
Scooby Newbie
Member#: 319378
Join Date: May 2012
Chapter/Region:
MWSOC
Location: West Central MN
Vehicle:2012 2.0i Sport Ltd. Satin White Pearl |
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07-13-2012, 09:24 AM | #1480 |
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Member#: 322264
Join Date: Jun 2012
Chapter/Region:
Tri-State
Location: Webster, NY
Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
My VW TDI was the only car that I topped off, because it didn't have the emissions equipment that could be damaged by overfilling.
And when I say topped off in the TDI, I mean topped off. I would literally add fuel until I could see it in the filler neck. Not only did this give me maximum range per tank, but it also made for very accurate fuel economy calculations, since I knew I was filling to the same level each time. I wish I could do this in the Impreza, but I know that I can't. |
07-13-2012, 11:55 AM | #1481 | |
Scooby Specialist
Member#: 313575
Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:2012 Impreza 2.0i HB |
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for the record, i add to the nearest half dollar after the first click. my car consistently gets in the 45-70mi range on that first bar...and with this fill method, i'm around 10gallons filled up when i hit the 1/4 tank left (3 bars). |
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07-16-2012, 11:07 AM | #1482 |
Scooby Newbie
Member#: 316535
Join Date: Apr 2012
Chapter/Region:
TXIC
Location: The Woodlands, TX
Vehicle:2007 WRX (Sold 2.0i) Silver |
What's up guys. New here to NASIOC. Have a '12 Impreza Sport Premium CVT. At about 2,500 miles right now and averaged 28.5 my last fillup. Lifetime so far is only about 25.5.
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07-16-2012, 11:40 AM | #1483 | |
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Member#: 315643
Join Date: Apr 2012
Chapter/Region:
South East
Location: Atlanta Ga
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after 150 miles of city driving with an exstimated 25 mpg. Spent 4 hours on the Hwy and it got up to 30.5 on the computer another 3 hours of really pushing it 80 mph on the highway netted me 30.9 on a new tank (200 miles or so) Last edited by auskip07; 07-16-2012 at 02:33 PM. |
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07-16-2012, 11:44 AM | #1484 |
Scooby Newbie
Member#: 316535
Join Date: Apr 2012
Chapter/Region:
TXIC
Location: The Woodlands, TX
Vehicle:2007 WRX (Sold 2.0i) Silver |
I've gotten 41 MPGs sustained over a 10 mile trip down I-45
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07-16-2012, 12:18 PM | #1485 |
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Member#: 313575
Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:2012 Impreza 2.0i HB |
i'm at 3300+ miles now and probably stating the obvious, but here are my cumulative observations (all guesstimates, if numerical)
- AC hits mpgs by 2-3 mpg - mileage really suffers going up and down hills (even with manual shifting) - really poor mileage in stop and go traffic - great mileage while cruising on flat ground - mileage starts to dive above 65mph - best correlation i see in mileage is inspecting "average speed" reported by car computer (at least for mixed driving) - car takes about 4miles to warm up my lifetime gauge mileage on the computer is now 29.7mpg. fuelly is 28.2mpg, but that doesn't account for the 3% odometer error which, if accounted for, brings it up to 29.0mpg. the computer is still an overestimate, but i like to use it as a slightly optimistic, but not unrealistic look at roughly how the car is doing. my lifetime average speed is around 27mph (haven't checked in a while, so i might be off, but i think that's about right). |
07-16-2012, 01:19 PM | #1486 |
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Member#: 319378
Join Date: May 2012
Chapter/Region:
MWSOC
Location: West Central MN
Vehicle:2012 2.0i Sport Ltd. Satin White Pearl |
Well it didn't continue, my last fill up it was back to normal. I don't know what it was, for a while my mileage was off the charts, and it started right after I filled up at the same gas station I always go to. Only thing I did differently was floor it out of the gas station in manual mode and held it at high rpm longer than usual, and accidentally hit downshift instead of up shift once, which made it lurch a bit before it upshifted itself and then went into some state where I couldn't accelerate at all for a few seconds, surprised it let me downshift.
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07-16-2012, 01:22 PM | #1487 |
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Member#: 75244
Join Date: Nov 2004
Chapter/Region:
MWSOC
Location: Minnesota
Vehicle:2013 WRX Base Other Blue |
I just finished my first tank of gas with my manual Impreza 2.0I 4door and I got around 31mpg.
I was very pleased. I didn't even drive like a grandma the whole time. |
07-16-2012, 02:32 PM | #1488 |
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Member#: 315643
Join Date: Apr 2012
Chapter/Region:
South East
Location: Atlanta Ga
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Im sure everyone on here would get that if they found a particular stretch of 10 miles with a slight down hill slope.
This is the reason you report full tanks of gas. in 300 miles it gives you a chance to expereience a wide variety of grades. |
07-16-2012, 02:36 PM | #1489 | |
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Member#: 302559
Join Date: Nov 2011
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Quote:
Even one tank of gas can have a fairly big shift in the MPG, based on the filling station used, the outside air temp, and the filler nozzle. |
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07-16-2012, 02:37 PM | #1490 |
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Member#: 316535
Join Date: Apr 2012
Chapter/Region:
TXIC
Location: The Woodlands, TX
Vehicle:2007 WRX (Sold 2.0i) Silver |
Just reporting what I've found. I turned the A/C off and set cruise to 65. It wasn't flat. It wasn't downhill. It was relatively hilly.
I've also held 37 over a 60 mile round-trip commute. Full tanks suck though and are around 28.5 due to my lively driving in stop and go |
07-16-2012, 02:50 PM | #1491 | |
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Join Date: Apr 2012
Chapter/Region:
South East
Location: Atlanta Ga
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Oh and Welcome to the SEC. From an Auburn Alum |
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07-16-2012, 02:55 PM | #1492 |
Scooby Newbie
Member#: 316535
Join Date: Apr 2012
Chapter/Region:
TXIC
Location: The Woodlands, TX
Vehicle:2007 WRX (Sold 2.0i) Silver |
Thanks man!
You are correct, Texas isn't hilly around Houston. But I-45 as it goes over surface streets at various exit-points is actually hilly enough to do some MPG damage. Take my findings with a grain of salt. After my first OC I'll start tracking on a tank-to-tank basis and maybe post some "samples" up here. |
07-16-2012, 08:17 PM | #1493 | |
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Member#: 309257
Join Date: Feb 2012
Chapter/Region:
NWIC
Location: Kirkland WA
Vehicle:2012 Imp 5D Prem CVT Marine Blue |
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Just got back from a nice weekend with my wife in Leavenworth WA driving from Seattle area. We did a loop including Stevens(4000ft) , Blewitt(3000ft) and Snoqualmie(3000 ft) passes, a few miles of gravel road, throw in some 50-60mph mtn roads, a few 20 mile stretches of 30mph country roads, some of that on gravel, and the coup de grace, getting stuck in two NASTY traffic jams, one taking an hour to go a couple miles between a couple of towns on flat roads with the instantaneous gage reading about 7mpg, and another stuck in stop and go for a bunch of miles on what should have been 70mph freeway to get around a winnebago that burnt to the ground(leaving a hole in the pavement). Per car gauge (usually 1.8mpg optimistic), 34.5mpg for trip. Can't complain about that. Finally getting UP to 21mpg for short hop city driving though, which is most of what my wife uses it for. Thats a bummer. Obviously I have to borrow the car more for my long drives to hikes. (too bad it doesn't have more clearance), its darn fun car to drive in the mountains and has PLENTY of zip, if you know how to drive a small 4 banger, which is mostly what I have owned. I was playing around a bit more with upshifting the CVT when coasting on this trip. (Yes I had the TSB's done) |
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07-17-2012, 12:05 PM | #1494 |
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Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:2012 Impreza 2.0i HB |
good stuff, thom.
how many miles do you have on the car now? has your starting problem gone away? i'm glad to hear you are finally creeping into the 20s. as i've experienced different things in my car now, i can see how low 20s would be the norm for short hop driving in a "real city" (as opposed to my suburbia city driving which yields me in the mid 20s). too many accelerations every 0.1 miles like i encountered in san francisco this weekend really kills the mileage. |
07-17-2012, 10:10 PM | #1495 |
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Location: In a tent
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07-17-2012, 10:19 PM | #1496 | |
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Join Date: Dec 2011
Location: Northern NJ
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-- Disagree with the assessment of impact of A/C. I don't have hard scientific #s but from some usage I estimate closer to 1-1.5mpg. |
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07-18-2012, 09:39 AM | #1497 |
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Join Date: Aug 2004
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1100 miles now on my Sport Premium Manual.
1st couple tanks - about 28mpg (per actual mileage/gallon calc, not computer). Mixed driving - Commuting to work, mostly interstate there, and mostly city back (due to construction). Watching the computer mpg calc, I see a big hit everytime the a/c compressor kicks on - about 3-4 mpg. |
07-18-2012, 09:49 AM | #1498 | |
Scooby Newbie
Member#: 319378
Join Date: May 2012
Chapter/Region:
MWSOC
Location: West Central MN
Vehicle:2012 2.0i Sport Ltd. Satin White Pearl |
Quote:
As for speed, my best tank included cruising 70mph for at least 100 of the miles, with A/C blasting |
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07-18-2012, 10:18 AM | #1499 | |
Scooby Specialist
Member#: 302491
Join Date: Nov 2011
Chapter/Region:
Tri-State
Location: Buffalo, NY
Vehicle:2012 Impreza 2.0i Pr Dark Grey Metallic CVT |
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But Haunty, I also think while driving highway it doesn't seem to affect it. |
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07-18-2012, 10:23 AM | #1500 | |
Scooby Newbie
Member#: 319378
Join Date: May 2012
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