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Wagons Subaru Crew Subaru Legacy & Outback Subaru Legacy/Outback: MPG-Real World Numbers
98 messages, Last post on Jul 29, 2009 at 7:46 AM
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Replying to: ateixeira (Aug 14, 2007 10:14 am)
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I am guessing you are encountering a lot more conjested roads than in LA than in Colorado Springs. It also could be because the adaptive software that runs the ECU needs to be reset in order to compensate for the change in air density and driving style.
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Replying to: shrinermonkey (Aug 14, 2007 10:44 am) |
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California has notoriously bad gas and is the likely culprit in your mysteriously lower mileage. I moved to Sacramento from Reno but continue to work in Reno, so after years of driving the same "loop" and filling up in different places, I can attest to getting 3-4mpg less on any tank of gas that I filled in CA versus one that I filled in Nevada. This has held true on both of my Subarus, my Honda, and my pickup. For whatever reason, the gas that is supplied to CA stations is apparently formulated differently and is known to cause drivability problems in some cars. COBB Tuning, for example, had different ECU maps for CA cars to factor in the crummy gas that we receive here...the original map that they were using on to reflash the computers on WRXs was causing some noticable drivability problems (stumbling, etc) in CA cars. It's ironic that in a state so obsessed with emmissions and efficiency that they would supply gas that routinely delivers *less* efficiency than neighboring states. Brian |
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Replying to: bkaiser1 (Aug 14, 2007 12:30 pm) Here in MD most pumps have switched over to E10, i.e. 10% ethanol. There is less energy in ethanol so most people will get a slight drop in efficiency.
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Replying to: ateixeira (Aug 14, 2007 12:37 pm) #1- it costs 15 to 20 cents less per gallon. #2- I get the best MPG from a Shell station in MN with 10% ethanol(29mpg in a 2001 Outback with 110K miles). --jay
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Replying to: jay_24 (Aug 15, 2007 5:32 am) Personally, I have not observed a noticeable change in MPG since MD went with E10. |
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Replying to: jay_24 (Aug 15, 2007 5:32 am) -Brian |
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G'day There arer a fair number of possibilites. Try running the tank right down and then refill through several cycles using a good quality branded (eg Shell etc) fuel rather than supermarket or discount chain. The ethanol mix should not change economy much. Also consciously think about driving habits of those around you. I find my fuel economy changes between cities although ostensibly the traffic is about the same. This is probaby because of the need to drive differently in differnt traffic conditions. For example, here in Australia, the traffic in Melbourne is solid but fairly calm. Sydney is more aggressive although congestion is probably about the same at present. I find my usage leaps when I drive in Sydney because you have to be more pushy to retaing your place in traffic Cheers Graham |
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Replying to: mjross (Aug 14, 2007 10:21 am) You're running leaner in CO due to the altitude and richer in CA as the ECU adjust for condition. The ECU should settle in to CA conditions after a few hundred miles. -Dave
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