Does adding TRD stuff from Toyota kill MPG? - Toyota Yaris Forums

Yariswhite09 · 08-31-2009, 07:03 PM

I just bought a new yaris and I really want to customize it with Toyota's 18" TRD chrome wheels and the TRD shocks and performence suspension with a whole lotta body kits

My main concern: Is this going to negatively affect fuel economy? And if it does, how much am I going to sacrifice in MPG numbers? I get about 42-43 MPG in mixed driving right now with a 5 door hatchback with the automatic

Thanks guys!!!

Bob Dog · 08-31-2009, 07:12 PM

Shocks and supension no, big heavy wheels yes. That's really good mpg.

Sabretooth · 08-31-2009, 08:10 PM

actually, depending how quickly you corner...its possible to increase your handling with better suspension. Less slowing down results in less needed acceleration to reach a desirable speed.

Other than that, bigger and wider rims/tires will kill your mpg...best I have measured with my car is about 38mpg, thats with 7 inch wide rims, with a 205 wide tire.

If you want to increase your mpg's, a good item to get is a NST 10% underdrive pulley, people have reported increases of 2-3 mpg after install...it all depends on your driving habits.

thebarber · 08-31-2009, 08:46 PM

bigger rims will hurt the mpg if you drive a lot of stop and go....highway only, i dont think you'd notice a difference....

shocks/springs wont hurt mpg's unless you drive like a nut after you put them in

body kits will likely kill the low coefficient of friction that the yaris has....but likely moreso if you drive lots of highway

Qmobile · 09-01-2009, 03:52 AM

I hav'nt noticed any mpg change with my TRD axle-back or the drop-in for that matter, the sway bar now that's a different story/section in and of itself.

talnlnky · 09-01-2009, 01:00 PM

I keep getting tempted by the Underdrive pulley... I would love to have a few more mpg's... maybe boost me over 50... but at the same time, I believe that pulley would reduce the amount of current my alt would produce at idle... and i'm not a huge fan of that. I do run one 160watt amp right now.. and in the future will have two amps for a total of 450watts, or approx 50-60amps of draw depending on music type and volume level.

TRDMarty · 09-01-2009, 03:26 PM

Yariswhite09, I have a 08 Liftback with TRD 18's, TRD Cold Air Intake, TRD Lowering Springs, Shocks & SwayBar (All TRD) ''with an AUTO TRANS'' Results = 41MPG
This is combined, stop-n-go & freeway traffic

yarr_is · 09-01-2009, 05:33 PM

Just like what they say... bigger wheel = somewhat bad mpg. Although I gotta say it's hard to notice. And obviously the stiffer suspension the less comfortable ride hahaha

08-31-2009, 07:03 PM	#1
Yariswhite09 Drives: Toyota yaris 5 door polarwhite Join Date: Aug 2009 Location: Cleveland, OH Posts: 10	Does adding TRD stuff from Toyota kill MPG? I just bought a new yaris and I really want to customize it with Toyota's 18" TRD chrome wheels and the TRD shocks and performence suspension with a whole lotta body kits My main concern: Is this going to negatively affect fuel economy? And if it does, how much am I going to sacrifice in MPG numbers? I get about 42-43 MPG in mixed driving right now with a 5 door hatchback with the automatic Thanks guys!!!

08-31-2009, 08:10 PM	#3
Sabretooth 37HSSV View User's Garage Drives: '11 Mazdaspeed 3 Join Date: Jan 2007 Location: St Cloud FL Posts: 1,395	actually, depending how quickly you corner...its possible to increase your handling with better suspension. Less slowing down results in less needed acceleration to reach a desirable speed. Other than that, bigger and wider rims/tires will kill your mpg...best I have measured with my car is about 38mpg, thats with 7 inch wide rims, with a 205 wide tire. If you want to increase your mpg's, a good item to get is a NST 10% underdrive pulley, people have reported increases of 2-3 mpg after install...it all depends on your driving habits. __________________ 07 Toyota Yaris Hatchback -sold- 11 Mazdaspeed 3 -SRI/TIP, 3 inch TBI, Custom FMIC, Tuned by Cobb Accessport, HKS ssq2 BOV, Upgraded HPFP- Clean stock look... Killer performance.

08-31-2009, 08:46 PM	#4
thebarber daily driver View User's Garage Drives: the #wrecho Join Date: Jun 2006 Location: Grand Rapids, MI Posts: 5,877	bigger rims will hurt the mpg if you drive a lot of stop and go....highway only, i dont think you'd notice a difference.... shocks/springs wont hurt mpg's unless you drive like a nut after you put them in body kits will likely kill the low coefficient of friction that the yaris has....but likely moreso if you drive lots of highway __________________

09-01-2009, 03:52 AM	#5
Qmobile that's right I went there View User's Garage Drives: '08 Blazin' Blue,'10 Dark Red Join Date: Oct 2008 Location: Hoytville, ohio Posts: 800	I hav'nt noticed any mpg change with my TRD axle-back or the drop-in for that matter, the sway bar now that's a different story/section in and of itself. __________________ Mods: 15" SSC rims, TRD Exhaust, TRD Sway bar, TRD oil filler, TRD rad. cap, TYC tails, Debadged, Painted engine cover, Stock spoiler, Stock mud gaurds, OBX pedals. suggestions always welcome

09-01-2009, 01:00 PM	#6
talnlnky Audio Junky Drives: 08 liftback Join Date: Oct 2008 Location: Spokane, Wa Posts: 1,412	I keep getting tempted by the Underdrive pulley... I would love to have a few more mpg's... maybe boost me over 50... but at the same time, I believe that pulley would reduce the amount of current my alt would produce at idle... and i'm not a huge fan of that. I do run one 160watt amp right now.. and in the future will have two amps for a total of 450watts, or approx 50-60amps of draw depending on music type and volume level. __________________

08-31-2009, 07:12 PM	#2
Bob Dog DARK PHASE OF THE MOON Drives: 07 liftback Join Date: Apr 2009 Location: the Boondocks, NC Posts: 993	Shocks and supension no, big heavy wheels yes. That's really good mpg.

09-01-2009, 03:26 PM	#7
TRDMarty Drives: Polar White 2008, 3Dr HB TRD ' Join Date: Mar 2009 Location: Corona CA Posts: 403	Yariswhite09, I have a 08 Liftback with TRD 18's, TRD Cold Air Intake, TRD Lowering Springs, Shocks & SwayBar (All TRD) ''with an AUTO TRANS'' Results = 41MPG This is combined, stop-n-go & freeway traffic

09-01-2009, 05:33 PM	#8
yarr_is Drives: yaris Join Date: Sep 2009 Location: West LA Posts: 161	Just like what they say... bigger wheel = somewhat bad mpg. Although I gotta say it's hard to notice. And obviously the stiffer suspension the less comfortable ride hahaha

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