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Sedans Audi A4 Ultimate AWD Sports Sedans
828 messages, Last post on Oct 03, 2009 at 9:40 PM
You are in the Audi A4 Forum. Your Hosts are pat & karens
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Replying to: xeye (Jan 12, 2009 3:59 pm) The most common reason why engines deliver lower fuel economy in the winter is that fuel doesn't as easily vaporize in a very cold intake charge as it does in a warm or hot intake charge, and as such, the engine needs to run a tad richer to make sure the burn inside the cylinders is properly controlled. That said, depending upon how the intake is setup, turbocharged engines have the ability to negate the cold air/poor vaporization thing by relying on the warming effect the turbocharger(s) create by compressing the intake charge. Back in the 1980s I had a non-intercooled turbocharged car that actually got better fuel economy on the highway in the winter months, in fact, the best mileage it ever got was driving across Nebraska at something like ten degrees below zero. The question here is, "Does the 335i bypass the intercooler when the intake charge is cold and the engine is being operated at partial throttle?" Answer: I don't know for sure, but I kind of doubt it, that would be a lot of plumbing. Taken from a different perspective, Audi, with its FSI style engines that inject the fuel directly into the hot combustion chamber, is now producing cars that vary little winter vs. summer with regards to fuel economy. Best regards, Shipo
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Replying to: investor27 (Jan 12, 2009 11:47 am) |
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Replying to: shipo (Jan 12, 2009 4:21 pm) AFAIK Krzys
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Replying to: krzyss (Jan 13, 2009 12:34 pm) Anybody with more recent information? Best regards, Shipo
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Replying to: shipo (Jan 13, 2009 12:48 pm) At first it varied by the time of year, but now we use E10 year-round. No change in the formula seasonally any more. |
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I have 2 2006 mazda 6's ,a 2.3 i4 gt and a gt speed6.The fuel mileage difference between the 2 --- summer vs winter is about the same. Its 2 miles per gallon better in the summer. I watch mileage very carefully . This is real would driving . The biggest difference I have found is between gas brands ----- I know you wouldnt think so. I have found Shell to be the most inconsistent , sometimes 3 miles to the gallon less --- remember 2 cars , same conditions , same drivers and accurate calculations. Political concerns aside , Citgo is the most consistent. So turbo vs non turbo , 2 very similar cars (for this test) , the turbo still uses a little more gas in cold weather as does the non turbo. Buy the way both cars are great. thanks . I hope this offers some clarity to the subject.
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Replying to: richt5 (Jan 20, 2009 1:00 pm) Interesting to own the same car twice, despite major differences in the powertrains.
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Replying to: ateixeira (Feb 03, 2009 11:24 am) The A4 is a nice car but more bland. An automatic transmission just doesn't get me involved in the driving process; so I treat it like an appliance, with little urge to "push" it. |
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Hello all ! New here...figured it would be an intelligent place... Wife looking to buy a used (2004) AWD Sedan. Each has about 68,000 miles on it. Prices are apparent differences, will deal with that later. Looking at: AUDI A4 1.8 Quattro Infinity G35x BMW 325xi Mercedes c-240 Not looking for a 'race car'. Standard wife car; comfortable; good in snow. She likes these styles, so the Subarus are not a consideration. Looking for opinions on each. Maybe a quick summary that you may have on each. Seeing that it is an AUDI forum - please feel free to let me know why I should get her the AUDI rather than the others. I look forward to all your help. Please be as lively and opinionated as you'd like to be ! Thank you !!! Tooky (Will post in the other forums also)
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