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#1
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MPG change when upgrading to 20"?
for those of you who upgraded, did you notice a decrease in MPG? Love our 35d and would hate to lose the MPG just for some aesthetics. |
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#2
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There shouldn't be any change if the width is the same, assuming you don't change you driving style.
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#3
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Even if the width changes, the impact should be in the noise...imo
Diameter is all the same, so no change in force/torque/rpm/efficiency |
#4
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There should be a negative impact due to increased rotational inertia, unless you never stop or start. I'd expect it to be small, though.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#5
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Yeah, but no more then 3 or 4 mpg, right?
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#6
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Quote:
Oh don't forget, fender flares, additional drag.. Harry |
#7
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With OEMs/run flats the drop would probably be 1..2 MPG.
My beyern/non run flats combo is lighter than stock 18s, and MPG remained exactly the same. |
#8
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rotational mass remains the same but i'm going from 255/50R19 to 275/40R20. I know it already has more area in front of the wheel when it comes to aerodynamics but such a big car I don't know if its that significant.
3-4mpg is a pretty significant difference..... |
#9
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Rolling resistance is probably more important than aero for the tires themselves. Wider patch implies more resistance. I think it is pretty hard to drive the same on tires that handle better - I'm guessing there is some right foot action that outweighs mass, rolling resistance and aero combined!
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#10
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Quote:
Harry |
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