SuperCleanLGT Posted August 19, 2008 Share Posted August 19, 2008 Thoes w/ 18" or 19" wheels, have you noticed much decrease in MPG? Link to comment Share on other sites More sharing options...
ShrinerMonkey Posted August 19, 2008 Share Posted August 19, 2008 If you are spending a lot of money on large rims why would you care about mpg? Link to comment Share on other sites More sharing options...
mwiener2 Posted August 19, 2008 Share Posted August 19, 2008 Should have ZERO impact on highway mpg....excpet for differences in tire material My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
korpsepatrol Posted August 19, 2008 Share Posted August 19, 2008 when i switched to spec b wheels i got a HUGE drop in mpg to be honest, still don't know why. Not so much in highway miles just street. 2008 6mt Legacy Gt Spec B DGM - Not so Stock/Work in progress 2006 5mt Legacy Gt OBP - Sold 2005 5eat Legacy Gt OBP - RIP R.I.P Coxx Link to comment Share on other sites More sharing options...
mwiener2 Posted August 19, 2008 Share Posted August 19, 2008 city MPG will drop due to more rotational mass 1lb of rotational mass is equal to something like 5-10 lbs of overall mass My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
SubLo Posted August 19, 2008 Share Posted August 19, 2008 The correct answer is: if your overall tire diameter remains the same, there would be zero impact to MPG all other things being equal. Where the logic for a statement that limits noticeable changes to the highway only comes from I have no idea The reality is that there could be many variables such as (1) different tire sizes either chosen or due to manufacturer differences given the same numeric size (2) driving style changes due to increased/decreased euphoria over aesthetics (3) tire pressure (4) increased/decreased rolling resistance so on and so on. In most cases, the differences are nominal. ________________________________________________ [URL="http://legacygt.com/forums/vbpicgallery.php?do=view&g=1980"]'05 BSM OBXT Row-your-own, W.I.P. :rolleyes:[/URL] [URL="http://legacygt.com/forums/vbpicgallery.php?do=view&g=1242"]'06 Shrek B # 64 - The car the wife loved to hate :( Sold...[/URL] Link to comment Share on other sites More sharing options...
SuperCleanLGT Posted August 19, 2008 Author Share Posted August 19, 2008 I appreciate the quick input!!! Link to comment Share on other sites More sharing options...
JonLGT Posted August 19, 2008 Share Posted August 19, 2008 Unless you are changing tire sizes from stock, or weight MPG wont be affected. Link to comment Share on other sites More sharing options...
JoeFromPA Posted August 19, 2008 Share Posted August 19, 2008 I noticed a substantial increase in MPG for highway travel in the past in a very lightweight car when I tossed it's stock steel rims and weight to some lightweight alloys. Tire material, pressure, driving habits, and tire/wheel diameter have the most to do with it. Joe Link to comment Share on other sites More sharing options...
VXCL Posted August 20, 2008 Share Posted August 20, 2008 only time i noticed a difference was with 06 spec b wheels, but my stockers, 17 superturismos, and 18 ultraleggeras no real difference. the spec b wheels def weighed more so maybe that killed some gas around town. MAYHEM #122/22 STS NNJR SCCA AUTOX4U.COM XENON RETRO GUIDE Link to comment Share on other sites More sharing options...
korpsepatrol Posted August 20, 2008 Share Posted August 20, 2008 only time i noticed a difference was with 06 spec b wheels, but my stockers, 17 superturismos, and 18 ultraleggeras no real difference. the spec b wheels def weighed more so maybe that killed some gas around town. Yeah see i figured thats why. Thx for the clarification cause i thought this was gonna happen with all the larger wheels. 2008 6mt Legacy Gt Spec B DGM - Not so Stock/Work in progress 2006 5mt Legacy Gt OBP - Sold 2005 5eat Legacy Gt OBP - RIP R.I.P Coxx Link to comment Share on other sites More sharing options...
Ramathorn Posted August 20, 2008 Share Posted August 20, 2008 i noticed a 2mpg freeway increase when i dropped to 17's from my 18" rota subzero's. Link to comment Share on other sites More sharing options...
SubLo Posted August 20, 2008 Share Posted August 20, 2008 i noticed a 2mpg freeway increase when i dropped to 17's from my 18" rota subzero's. Umm... how about stating tire size please? Curious minds want to know. ________________________________________________ [URL="http://legacygt.com/forums/vbpicgallery.php?do=view&g=1980"]'05 BSM OBXT Row-your-own, W.I.P. :rolleyes:[/URL] [URL="http://legacygt.com/forums/vbpicgallery.php?do=view&g=1242"]'06 Shrek B # 64 - The car the wife loved to hate :( Sold...[/URL] Link to comment Share on other sites More sharing options...
Ramathorn Posted August 20, 2008 Share Posted August 20, 2008 dropping form 235/40/18 general exclaims to 205/50/17 bridgestone re92a on stock 08 impreza wrx wheels Link to comment Share on other sites More sharing options...
Ramathorn Posted August 20, 2008 Share Posted August 20, 2008 i dont have any comparison to the oem 05 legacy 2.5i 205/55/16 re92's that came with the car as when i got them they were taken off within 100 miles in favor for the rota's. Link to comment Share on other sites More sharing options...
itsme Posted August 20, 2008 Share Posted August 20, 2008 I'm runnig 19x7.5 w/225/35/19. The 19's weight the same as stock 17's if not a little less and I get @26mpg doing 75mph with the A/C on. I'm stage 2 right now. Racer X FMIC for '05-'09 LGTs, '08+ WRX and '10+ LGT,'14+ FXT, and '15+ WRX TMIC Racerxengineering.com Link to comment Share on other sites More sharing options...
Gire Posted August 20, 2008 Share Posted August 20, 2008 I put a Spec B sticker on the back and now get 45mpg. Link to comment Share on other sites More sharing options...
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