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  #16  
Old 03-11-2010, 11:10 PM
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Originally Posted by Skid Row Joe View Post
I doubt just tires make that huge difference in mpg. I would look to the winter formulation fuel, coupled with lower ambient operating temperatures as primary factors to lower mpg vs. just the 'tires.' Cold-weather mpg is dreadfully lower across the board.
I am sure all of this is true. To be clear however, tires make a major difference. I track my mileage/fuel economy every week. The week I changed my tires, (last November) I lost about 50 miles per tank, give or take a few. The temp. did not drop that week. Keep in mind these are studed winter tires. My point was that a less aggresive tred will lead to better mileage.
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  #17  
Old 03-16-2010, 02:29 AM
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Originally Posted by skinnison View Post
I am sure all of this is true. To be clear however, tires make a major difference. I track my mileage/fuel economy every week. The week I changed my tires, (last November) I lost about 50 miles per tank, give or take a few. The temp. did not drop that week. Keep in mind these are studed winter tires. My point was that a less aggresive tred will lead to better mileage.
Precisely - there is a thing called ROLLING RESISTANCE. Tires DO matter and can make a big difference. Don't listen to those who say otherwise.
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  #18  
Old 03-16-2010, 03:16 AM
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Originally Posted by skinnison View Post
I am sure all of this is true. To be clear however, tires make a major difference. I track my mileage/fuel economy every week. The week I changed my tires, (last November) I lost about 50 miles per tank, give or take a few. The temp. did not drop that week. Keep in mind these are studed winter tires. My point was that a less aggresive tred will lead to better mileage.
I find it hard to believe you lost ~20% fuel economy due to tread alone.
EDIT: After some searching...it's not even possible. You have another issue going on. Just coincidence. Tread can make no more than 5% difference in fuel economy according to an article on tirerack.
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  #19  
Old 03-16-2010, 03:25 AM
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Originally Posted by skinnison View Post
I agree with d.delano, (especially with the right foot). In addition, I get 370 miles before my fuel light somes on running 89 octane with my all season hankooks tires. These are not gas saving tires. When I change to my winter studs the fuel light comes on at 320 miles! That is 50 miles difference per tank! I was just thinking yeaterday that I can't wait to switch back.

Higher tire pressure helps too. I usually set mine at recommended max.
I basically don't believe the tires would cause a; "50 miles difference per tank."

You've got something else going on with your car - other than just tires.
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  #20  
Old 03-16-2010, 04:18 AM
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Originally Posted by d.delano View Post
Precisely - there is a thing called ROLLING RESISTANCE. Tires DO matter and can make a big difference. Don't listen to those who say otherwise.
Hence is why 4-matic cars are thirstier, because of the added friction of a second differential, and power divided by 4..
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  #21  
Old 03-16-2010, 01:25 PM
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Yes my snow tires caused a drop from 30 mpg to 26.But I will run them from now on,as I go off road to flea markets,and fishing.
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  #22  
Old 03-16-2010, 01:31 PM
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Originally Posted by Benz300 View Post
my 00 E430 4matic has been giving me 14mpg on highways. which to me is quite low. it advertises 20mpg. i think...
what can be done to increase the mileage ? any ideas would be helpful.
thanks in advance
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  #23  
Old 07-08-2010, 04:04 AM
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what are the other E430 owners getting for their city / highway gas mileage ?
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