Lower Avg MPG - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

lilred · 03-05-2019, 06:20 AM

I went from 19 city mpg avg with my hks sc to now running 11.1 avg mpg. Is there a possibly that weather has a major effect in this. Saturday was mid 60s today it’s 28 degrees.

why? · 03-05-2019, 07:17 AM

Quote:

Originally Posted by lilred

I went from 19 city mpg avg with my hks sc to now running 11.1 avg mpg. Is there a possibly that weather has a major effect in this. Saturday was mid 60s today it’s 28 degrees.

yes weather has a major effect on this. As does your driving habits and a ton of other things.

mrg666 · 03-05-2019, 08:35 AM

Quote:

Originally Posted by lilred

I went from 19 city mpg avg with my hks sc to now running 11.1 avg mpg. Is there a possibly that weather has a major effect in this. Saturday was mid 60s today it’s 28 degrees.

I am getting 29 mpg with JRSC in sub 32F temperatures in the city. Either you're driving like a maniac or car has a big problem.

Tcoat · 03-05-2019, 08:39 AM

Quote:

Originally Posted by mrg666

I am getting 29 mpg with JRSC in sub 32F temperatures in the city. Either you're driving like a maniac or car has a big problem.

This ^ There is no way on earth that you should be getting 11 no matter what the weather is. How are you getting the readings?

PetrolioBenzina · 03-05-2019, 09:24 AM

I get 14 on E95 NA. I drive like a maniac.

Little Mt. Fuji · 03-05-2019, 09:40 AM

i get 24-25 mpg with 75% city and 25% highway

humfrz · 03-05-2019, 01:47 PM

Quote:

Originally Posted by lilred

I went from 19 city mpg avg with my hks sc to now running 11.1 avg mpg. Is there a possibly that weather has a major effect in this. Saturday was mid 60s today it’s 28 degrees.

Assuming you measured your fuel consumption correctly, I think there is something wrong with your car.

Even ol @PetrolioBenzina can't get that low -

humfrz

Sasquachulator · 03-05-2019, 01:50 PM

are you driving at over 4k RPM constantly?

BigTuna · 03-05-2019, 01:55 PM

Sounds more like an exhaust or vacuum leak

Edit: or bad O2

soundman98 · 03-05-2019, 04:36 PM

Quote:

Originally Posted by Tcoat

This ^ There is no way on earth that you should be getting 11 no matter what the weather is. How are you getting the readings?

i do. low speeds and high rpm entertainment between stoplights.

mazeroni · 03-05-2019, 04:46 PM

You have a supercharger, right?

Did you just buy the car? (2013 with 7 posts)

If you bought the kit, then go to the tuner. If you don't know who tuned it, then consider finding a shop to look over the code and see if it is just dumping fuel to deal with the higher density of air or the temperature. Imagine if the car was only ever used in Florida and the tuner could never test colder temps. How would they know. Or it is like other people said - a leak somewhere.

milanojess · 03-05-2019, 04:48 PM

I get 19 in full stop n go traffics with JRSC driven in a smooth gas saving mode.
I get 29-30 freeway cruise, and 6+ at track.
At 11 I am guessing you drove all the way in first gear?!

Grady · 03-05-2019, 06:05 PM

I thought I drove like an Ass and I get 18 in the city. Are you pre warming your car? long idle will kill your calculated mileage.

FRSBRZGT86FAN · 03-06-2019, 07:46 PM

Time to datalog and see what's up

03-05-2019, 06:20 AM	#1
lilred Member Join Date: Jan 2019 Drives: 2013 FRS Location: N/A Posts: 13 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Lower Avg MPG I went from 19 city mpg avg with my hks sc to now running 11.1 avg mpg. Is there a possibly that weather has a major effect in this. Saturday was mid 60s today it’s 28 degrees.

03-05-2019, 01:55 PM	#9
BigTuna Senior Member Join Date: Jun 2015 Drives: 2013 WRB BRZ Location: Ohio Posts: 672 Thanks: 258 Thanked 477 Times in 275 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Sounds more like an exhaust or vacuum leak Edit: or bad O2 __________________ 2013 WRB "Build" Thread

03-06-2019, 07:46 PM	#14
FRSBRZGT86FAN Senior Member Join Date: Jun 2013 Drives: 2023 GR SUPRA,15 FR-S (SOLD) Location: Philadelphia, PA Posts: 4,235 Thanks: 3,086 Thanked 2,100 Times in 1,397 Posts Mentioned: 31 Post(s) Tagged: 2 Thread(s)	Time to datalog and see what's up __________________ SOLDOFT Stage 2 UEL E85/Nameless Performance 3 inch axleback with 5 inch mufflers/ TRD CAI / CNT UEL/ Cusco Strut BAR & LHD Brake Stop / "JDM" Toyota Badges / WinJet JDM headlights - DRL MOD from fteightysix.com - 5000K Diode Dynamics HID kit / Diode Dynamics LED interior Lights and sidemarker bulbs / JDM Clear Sidemarkers / Diode Dynamics LED switchbacks/ OLM LED rear turn signals / Tap Turn RelaySOLD

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03-05-2019, 09:24 AM	#5
PetrolioBenzina Senior Member Join Date: Sep 2016 Drives: 17 86 Location: Oregon Posts: 1,671 Thanks: 75 Thanked 1,133 Times in 647 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	I get 14 on E95 NA. I drive like a maniac.

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03-05-2019, 04:46 PM	#11
mazeroni Senior Member Join Date: Aug 2015 Drives: 2013 Scion FR-S Series 10 Location: Nashville, TN Posts: 1,116 Thanks: 600 Thanked 1,017 Times in 512 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	You have a supercharger, right? Did you just buy the car? (2013 with 7 posts) If you bought the kit, then go to the tuner. If you don't know who tuned it, then consider finding a shop to look over the code and see if it is just dumping fuel to deal with the higher density of air or the temperature. Imagine if the car was only ever used in Florida and the tuner could never test colder temps. How would they know. Or it is like other people said - a leak somewhere.

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