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#1
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Who has aftermarket 20"s and have seen MPG dropped?
I could have swapped my stock wheels and test for a tank but I will have to have the tire shop transfer the TPMS, which is a lot of hassle and I am too lazy for that. Hope someone had seen and can confirm similar MPG drop going from stock 18's to some cheap ass aftermarket 20's
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---------------------------------------------------------------------------------------------------------------------------------------------- 2010 BMW X5 35d Diesel (Current) Prem/Tech/RB/RC/3rd row/ Black 20"s 2002 Porsche Carrera 4 cabriolet (Current) H&R, 19" VIP Modular VR05 2007 530i Black Sapphire (Returned) Steptronic/ Sport Pkg/ Premium Pkg/ NAV/ M Tech/ Black 20's |
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#2
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I also believe they cause lower MPG. I have reps on a 3.0si and I am only getting 15mpg, barely, with 75% city driving. I should see 17ish - I'm not all that heavy on the gas. Of course I can't really compare (or complain) since I got these only about 500mi. into ownership and was actually getting break-in [low] gas mileage to begin with. I don't drive that much so it's not a big deal to me but I just wanted to confirm that I'm getting lower than expected mpg with them.
Separate question - I know there are many [many] 30i & 35d owners out there - give us an idea of what you're getting with stock 18/19s.
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'08 X5 3.0si - Alpine White / Saddle Brown interior Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights Coded: Digital speedo, windows/sunroof/tailgate close via keyfob X5 pics at Flickr Last edited by rh71; 03-16-2010 at 07:34 PM. |
#3
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I went from 18's to 20's doing city I get about 300 to the tank on hwy close to 400..It's dropped between 20-50miles a tank on avg..
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BGReddy00 09 X5 3.0 | 214 Style Powdercoated Black Wheels | Painted Moldings - Bumpers | Fender Extensions | 5% Lumar Tint | Black Kidneys | Quad Exhaust Tips |
#4
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It is pretty well documented (on most sports car forums) that adding unsprung (rotating) weight will decrease performance and increase fuel consumption. The 20s are pretty heavy with the 275/315 setup. General rule of thumb is that you can multiply the unsprung weight by a factor of 4 to give you an idea of sprung weight effect. For instance if you add 10 lbs to each wheel, the comparative sprung weight increase would be 160 lbs.
This is why people make such a big deal of lightweight forged wheels (Neez, RAC, BBS etc).
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2008 X5 4.8i BSM/Blk - premium, sports with 20" 214s, navigation, rear climate, adaptive ride, dark bamboo, running boards, 3rd row seats, USB audio, high speed maximum, etc etc Mods: Smoked reflectors | Hoen xenon match fogs and angel eyes | LED plate bulbs | 18" winter wheels Other vehicles: 2002 M3 Vert TiAG/Blk - with every option and many mods | 2009 Chevy Silverado LTZ - fully loaded |
#5
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what's the break in period for our rides anyways?
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#6
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stock 18's (style 210) - avg over 4 months - i got a solid 18.5mpg.
just got the 19" style 212 wheels, so i will update you how i do on that... |
#7
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There is also more aerodynamic drag and rolling friction due to the wider tires.
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12 X5 M - 06 X5 4.8iS - 03 X5 4.4i - 03 M5 - 02 X5 4.6is - 99 M3 Dinan S3 - 98 M3 - 92 850i-6 - 92 850i - 91 325ix - 89 M3 2.5 - and a few parts cars |
#8
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Yeah. Lost close to 1 mpg when I went from 20's to 21's. Larger wheels just increase fuel consumption.
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2008 X5 4.8 White w/ Black Interior w/ Bamboo Trim | Premium | Sports + 214" | Tech | Cold Weather | Rear Climate | Premium Sound | Active Vent Seats | Heads-Up | Comfort Access | 3rd Row | Aero Kit | Huper Optik Tint | Clear Reflectors |
#9
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ok with all your confirmations, I feel much better. I rather lose a few mpg if I have to just to keep my 20's, I just had to make sure it wasn't just my car thats doing it.
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---------------------------------------------------------------------------------------------------------------------------------------------- 2010 BMW X5 35d Diesel (Current) Prem/Tech/RB/RC/3rd row/ Black 20"s 2002 Porsche Carrera 4 cabriolet (Current) H&R, 19" VIP Modular VR05 2007 530i Black Sapphire (Returned) Steptronic/ Sport Pkg/ Premium Pkg/ NAV/ M Tech/ Black 20's |
#10
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This may not be an option for the X but when I bought the winter setup on my 545, If my memory serves me correct the weight difference between the Micheline's and the Blizzak's were 3-4 lbs per tire. The performance review were pretty close but so I figured the weight savings per tire would be better than .1 higher rating
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2012 X5 50i ZAP(2VA, 336, 465), ZTP, ZPP, ZPS(6VC), ZCW, ZRC, 322, 4UB, 4NC, 610 2011 ///M3 Silverstone II 2011 X5 50i(lemon) -- SOLD -- 08 550 Msport 07 X5 4.8I sport 04 545i sport 02 4.4i sport 01 540I M/sport 00 SL500 97 SL500 |
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