450exc115 Posted December 16, 2010 Share Posted December 16, 2010 My wifes Legacy needed plugs every two years or so and wires (02 Legacy) every 3 or so.. I knew it need plugs when the MPG dipped 2-3.. Try new plugs. Link to comment Share on other sites More sharing options...
SCHM1AN Posted December 16, 2010 Share Posted December 16, 2010 I don't think so. Not for winter, anyway. The key is speed on the highway. Wind resistance increases with the square of relative wind speed. The contribution of speed is extremely significant. I'm going to try and start cruising at 55/65mph as limits allow. I'm sensing you're also a mechanical engineer... Link to comment Share on other sites More sharing options...
450exc115 Posted December 17, 2010 Share Posted December 17, 2010 I don't think so. Not for winter, anyway. The key is speed on the highway. Wind resistance increases with the square of relative wind speed. The contribution of speed is extremely significant. I'm going to try and start cruising at 55/65mph as limits allow. Don't forget to factor in where the sweet spot is in the motor for efficency. I had a 94 Audi S4 and it got 26-27mpg at 80-85 but would be closer to 25-24mpg at 65-70. Part of it could be how the air profile was at that speed and what power the motor was producing. It was the first year of the S4 which was more of a Euro model and design for the Autobahn. Link to comment Share on other sites More sharing options...
BAC5.2 Posted December 17, 2010 Author Share Posted December 17, 2010 I'm sensing you're also a mechanical engineer... ding ding ding! [URL="http://legacygt.com/forums/showthread.php/proper-flip-key-interesti-159894.html"]Flip Key Development Thread[/URL] "Genius may have its limitations, but stupidity is not thus handicapped." - E. Hubbard Link to comment Share on other sites More sharing options...
boymk123 Posted December 17, 2010 Share Posted December 17, 2010 16.2 as for today Link to comment Share on other sites More sharing options...
boymk123 Posted December 17, 2010 Share Posted December 17, 2010 I don't think so. Not for winter, anyway. The key is speed on the highway. Wind resistance increases with the square of relative wind speed. The contribution of speed is extremely significant. I'm going to try and start cruising at 55/65mph as limits allow. velocity = triple (power) u gain one, u have to triple another, just simple math Link to comment Share on other sites More sharing options...
BAC5.2 Posted December 17, 2010 Author Share Posted December 17, 2010 velocity = triple (power) u gain one, u have to triple another, just simple math I don't think you understood what I was saying. Wind resistance increases with the square of the relative windspeed. I wasn't talking about power consumption (which does increase proportionally to the cube of velocity). [URL="http://legacygt.com/forums/showthread.php/proper-flip-key-interesti-159894.html"]Flip Key Development Thread[/URL] "Genius may have its limitations, but stupidity is not thus handicapped." - E. Hubbard Link to comment Share on other sites More sharing options...
thestratomaster Posted December 17, 2010 Share Posted December 17, 2010 im only getting 21-23 the last few tanks in my NA Link to comment Share on other sites More sharing options...
LGT For ME Posted December 17, 2010 Share Posted December 17, 2010 Last few tanks of winter fuel 21mpg, summer time 24-25mpg. I wonder if this same drop in mpg is similar for those running E85? Link to comment Share on other sites More sharing options...
kramm Posted December 17, 2010 Share Posted December 17, 2010 Made a 2 hour drive home from snowboarding last night with probably 90% highway driving and ended up at 25.5 mpg. Pretty happy with that considering it's an H6 with awd and winter blended fuels. Link to comment Share on other sites More sharing options...
blaze741 Posted December 17, 2010 Share Posted December 17, 2010 what stations do you fill at? I see differences when I fill up at lower no brand name stations like quikfil or bj's fuel. I use Exxon/Mobil consistently and I see a more normal MPG rather than a 2-3mpg drop when using cheap gas. Also i use the same station consistently. Link to comment Share on other sites More sharing options...
ehsnils Posted December 17, 2010 Share Posted December 17, 2010 Ended up with something like 20mpg for my Outback with 4EAT and winter weather. Link to comment Share on other sites More sharing options...
kramm Posted December 17, 2010 Share Posted December 17, 2010 I try to go to top tier stations when they're around (Road Ranger, Shell, Exxon etc) but last night was BP which I feel is usually pretty consistent as well. Link to comment Share on other sites More sharing options...
450exc115 Posted December 17, 2010 Share Posted December 17, 2010 I don't think you understood what I was saying. Wind resistance increases with the square of the relative windspeed. I wasn't talking about power consumption (which does increase proportionally to the cube of velocity). Being engineers though you should know that straight up physics isn't always easily applied. Most of the time cars are designed to reach max mpg and lowest emissions at highway cruz speeds. Since the good old USA is a typically 65mph then that is most likely where our cars are designed to be the most efficent. Link to comment Share on other sites More sharing options...
thestratomaster Posted December 17, 2010 Share Posted December 17, 2010 Being engineers though you should know that straight up physics isn't always easily applied. Most of the time cars are designed to reach max mpg and lowest emissions at highway cruz speeds. Since the good old USA is a typically 65mph then that is most likely where our cars are designed to be the most efficent. this situation has less physics applied, rather more thermodynamics and principles of engines operating on the otto cycle Link to comment Share on other sites More sharing options...
450exc115 Posted December 18, 2010 Share Posted December 18, 2010 this situation has less physics applied, rather more thermodynamics and principles of engines operating on the otto cycle Don't forget fluids and compressable flow. Link to comment Share on other sites More sharing options...
thestratomaster Posted December 18, 2010 Share Posted December 18, 2010 Don't forget fluids and compressable flow. hah...yeah, this is true Link to comment Share on other sites More sharing options...
Noeladams Posted December 18, 2010 Share Posted December 18, 2010 Interesting, i'm getting about 15-17 right now around town. Not sure about freeway driving because I only hop on for a few miles so it really isn't accurate. Link to comment Share on other sites More sharing options...
lee07 Posted December 18, 2010 Share Posted December 18, 2010 I was averaging 24 mpg like 2 months ago but now, it's at 19 mpg and still dropping. So I might get low teens soon at this rate. Not sure if its weather related or if somethings wrong with the car. I guess I'll wait until spring to see if it gets back to low teens! I filled up today and it said I could only go 280 miles. Thats 16 mpg!!!! Link to comment Share on other sites More sharing options...
RIPjeep2002 Posted December 18, 2010 Share Posted December 18, 2010 93 octane here, been getting roughly 17-19 mpg with about 75% city and 25% highway. Link to comment Share on other sites More sharing options...
Jewishcowboy Posted December 18, 2010 Share Posted December 18, 2010 I'm down about 3-4 mpg myself. The colder it is outside the worse the milage will be. It hasn't been above freezing here in over 2 weeks:mad: Link to comment Share on other sites More sharing options...
boymk123 Posted December 18, 2010 Share Posted December 18, 2010 I don't think you understood what I was saying. Wind resistance increases with the square of the relative windspeed. I wasn't talking about power consumption (which does increase proportionally to the cube of velocity). oh, that was different story, I was talking about constant wind speed... Link to comment Share on other sites More sharing options...
05_2.5 Posted December 18, 2010 Share Posted December 18, 2010 in my 2.5i i'm currently getting 27 mpg which is down about 2 mpgs from last winter. i'm thinking its because my valve cover gaskets are leaking oil into my spark plug wells. in the next week or so its going in for service and getting new gaskets plugs and wires under warrenty. hopefully that will get it back up. Link to comment Share on other sites More sharing options...
BAC5.2 Posted December 19, 2010 Author Share Posted December 19, 2010 I would have kept my 2.5SE had I gotten 27mpg! I was getting 12mpg when Subaru finally decided to buy it back. [URL="http://legacygt.com/forums/showthread.php/proper-flip-key-interesti-159894.html"]Flip Key Development Thread[/URL] "Genius may have its limitations, but stupidity is not thus handicapped." - E. Hubbard Link to comment Share on other sites More sharing options...
sk_leb Posted December 19, 2010 Share Posted December 19, 2010 I would have kept my 2.5SE had I gotten 27mpg! I was getting 12mpg when Subaru finally decided to buy it back. My current city MPG is a little over 20, and my highway is in the upper 30s. I just signed up for Fuelly - and will be keeping track of my fill ups and average MPGs. Link to comment Share on other sites More sharing options...
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