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06-08-2013, 01:43 PM | #4376 | ||||
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Quote:
Pretty much all true, except that time is not involved. In your "Kwh / horsepower-hour" time cancels out. It breaks down to joules/joule in terms of energy in / energy out. Power is energy / time, which is not part of it. Quote:
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06-08-2013, 01:57 PM | #4377 |
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06-08-2013, 02:14 PM | #4378 |
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I still think the impreza would get almost as good mpg with the Forester's 2.5 and offer much better performance. I would gladly trade 1-2mpg for the 2.5's power
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06-08-2013, 03:08 PM | #4379 |
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You can use a number of unit types for BSFC:
-Energy over time vs power (GPH per HP) -Energy vs power over time (Gal per HP hour) HP and Kw describe power. HP/hour and Kwh describe work. Work is power over time. The joule is a unit of work, so it doesn't need the /time conversion like the others. All forms are valid. |
06-08-2013, 04:33 PM | #4380 | |
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06-08-2013, 07:43 PM | #4381 |
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I only mentioned it for an example, I hesitated to mention it at all, I'm not a precocious person. I just worked very very hard long hours building businesses. It's not the coolest car I have though nor is it near the fastest
I still love driving my SP CVT for everyday runaround car. Best buy I've made I think! |
06-08-2013, 11:14 PM | #4382 |
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Haha its all good.
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06-09-2013, 12:14 PM | #4383 |
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Well temps are heating up and I was running the A/C for the entire last tank. 80% city 20% highway I'd estimate, and the mileage came out to 20.5 mpg. '13 sport 5sp. Ugh.
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06-09-2013, 12:22 PM | #4384 |
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You have a severe issue then. It's been hot here, I've hauled wife and two kids last two tanks with air on, driving thru hills and driving the piss out of it, using M mode lots, and redlining it lots to make sure rings are seated and it breaks in like I want it. I have 48xx miles on 2013 CVT SP, and tanks were 26.5 and 27.4 hand calcul. I'd never drive it this way normally everyday. I can't believe the 5-sp can be that much worse. Maybe it is, but then that says a lot for the CVT. that would irritate some on here if that's true. I do run ethanol free 91 octane though.
Last edited by G2Spfld; 06-09-2013 at 01:31 PM. |
06-09-2013, 02:19 PM | #4385 |
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Short drives and a heavy foot could give you very low mpg's I guess.
I have never seen mpgs anywhere close to 20mpg with my 5 speed (even in the winter with snows and winter gas), but I never drive it only a mile or two at a time and I am not a stoplight drag racer. The car is broke or the driver knows something that isn't being shared, yet, about how the car is being driven. |
06-10-2013, 02:17 PM | #4386 |
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Lowest I've gotten is 24.
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06-10-2013, 03:27 PM | #4387 |
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06-11-2013, 07:00 AM | #4388 |
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32.8 this last tank. Used AC almost the entire time. Mainly back and forth to work.
John |
06-11-2013, 05:02 PM | #4389 |
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Last tank was the worst in a long time, 30.2 mpg. Different work place so instead of mostly hwy, the cummute is now 80% city.
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06-11-2013, 06:50 PM | #4390 |
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06-12-2013, 03:51 PM | #4391 |
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My commute changed from 40 miles of mostly highway to 6 miles of mostly suburban traffic. So my fuel economy has gone from about averaging 30 mpg to 25 mpg. I'm going to adjust my style to try to get as much out of it, but 25 mpg is more than the 16 mpg my last car was getting on a similar commute.
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06-12-2013, 04:03 PM | #4392 | |
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Quote:
Annoyed me at first but overall It's not so bad. Maybe when they push the hybrid on down we could see 28/30 regular tanks. That'd be one hell of an improv lol. |
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06-12-2013, 05:59 PM | #4393 |
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So...this may make no sense but my 2013 5dr CVT gets about .4 mpg better when I have the AC on. I have tried it about a dozen times and every time my average mpg goes up when I have the AC on. I dont get it...how could this be possible?
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06-12-2013, 06:10 PM | #4394 | |
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Or, if your car has Auto climate control, it is possible the AC is cycling more than you realize in auto mode... Or you drive it differently when you have a cool head... Can't think of another reason, AC isn't free, the compressor robs power from the engine to provide cooling breezes, so that makes the engine consume more gas, all other things being equal Last edited by Zeeper; 06-13-2013 at 06:27 AM. |
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06-12-2013, 09:18 PM | #4395 |
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I think mpgomatic got higher with ac on. Weird.
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06-12-2013, 11:16 PM | #4396 |
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mythbusters proved that A/C on is more fuel efficient than windows down though!
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06-13-2013, 12:14 AM | #4397 | |
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Did a 25-30 mile run tonight, mix of suburban, village, and highway (55 mph) miles, and was solidly in the 32-34 mpg range, and I wasn't light on the gas. If I had really tried, would have been in the high 30's. So I can understand what you're experiencing. Still reasonable in my book for the circumstances. |
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06-13-2013, 10:47 AM | #4398 |
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My guess is this one. You might be changing your driving habits while using AC. Seeing as how you are at least somewhat aware AC has an effect on mpg I suspect this to be the case.
I know I drive slower with AC on. |
06-13-2013, 12:00 PM | #4399 | |
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Location: SF Bay Area, CA
Vehicle:2012 Impreza 2.0i HB |
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for my 4mi commute between home and the train station, average speed in suburbia is 18mph (lots of lights on average) with 24-25mpg reported by the computer. mixed in with some weekend driving which involves longer stints and short stretches of freeway (so not optimal for mileage because of the need to accelerate to 65mph and only drive it for 4-5miles), it boosts me into the 29mpg range on the computer. in the end, my cars lifetime computer mileage is 29.4mpg* at an average speed of about 26mph. * which is i know optimistic, even with odometer errors accounted for. it actually is closer to 28.5 when everything is accounted for. |
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06-17-2013, 03:00 PM | #4400 |
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Vehicle:2012 Impreza Sport DGM |
32.4mpg (with an avg mph of 32)...
i have to say, im completely satisfied with these numbers in this fun little DD cuz I drive in m mode and push her to perform from time to time.. DGM 2012 impreza sport cvt, btw. |
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