Worse gas mileage than usual - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ephemerality · 06-21-2019, 03:02 AM

Hey guys, got my GT86 about 4 months ago and just started checking the mileage because I felt that I was visiting the gas station a little too often.

I'm getting 8.8 km/litre combined which seems absurd. Everyone I've spoken to IRL gets at least 11-12km/litre.

My car is mostly stock with an aftermarket catback, so I have no idea why it is getting such bad mileage.

I've cleaned the MAFS and changed the engine oil.. Does anyone know what else to check or how to fix it?

p1l0t · 06-21-2019, 03:16 AM

I got a 74 Lincoln Mark IV that gets 10 MILES to the GALLON because MURICA. So you're fine.

Sent from my SM-G975U using Tapatalk

Mr.ac · 06-21-2019, 03:28 AM

What are your driving habits?
Checked tire pressure? Is it low?
How are you calculating mpg/kml?

ephemerality · 06-21-2019, 03:58 AM

Quote:

Originally Posted by Mr.ac

What are your driving habits?
Checked tire pressure? Is it low?
How are you calculating mpg/kml?

This is driving like a normal person not going past 5000 rpm ever.
Tire pressure is 34 psi checked it last week.
Using the automatic calculator and also calculating litres/trip

p1l0t · 06-21-2019, 04:11 AM

Who tuned your car after the catback?

Sent from my SM-G975U using Tapatalk

ephemerality · 06-21-2019, 04:14 AM

Quote:

Originally Posted by p1l0t

Who tuned your car after the catback?

Sent from my SM-G975U using Tapatalk

So the car was imported to New Zealand from Japan, and has a japanese exhaust. There was a single owner before me who had the car for about 3 months before selling to a dealer. I bought the car and have only swapped out the wheels for forged wheels.

They wouldn't have imported with a tune right?

p1l0t · 06-21-2019, 04:22 AM

Quote:

Originally Posted by ephemerality

So the car was imported to New Zealand from Japan, and has a japanese exhaust. There was a single owner before me who had the car for about 3 months before selling to a dealer. I bought the car and have only swapped out the wheels for forged wheels.

They wouldn't have imported with a tune right?

Yeah I would get it tuned just to be safe. You would be amazed what a guy and a few hours on a computer connected to a dyno can smooth out.

Sent from my SM-G975U using Tapatalk

BigTuna · 06-21-2019, 08:27 AM

Check for intake/vacuum leaks.

Also, if you have the means of data logging/monitoring, take a look at your fuel trims. This can tell you if it's running rich.

PetrolioBenzina · 06-21-2019, 10:37 AM

Quote:

Originally Posted by ephemerality

This is driving like a normal person not going past 5000 rpm ever.
Tire pressure is 34 psi checked it last week.
Using the automatic calculator and also calculating litres/trip

Disagree. Normal people wind it out at every opportunity.

ephemerality · 06-21-2019, 10:52 AM

Quote:

Originally Posted by PetrolioBenzina

Disagree. Normal people wind it out at every opportunity.

By 'normal' I meant a typical non-86 driver. Only kept it under 5000 for the purposes of testing efficiecny

extrashaky · 06-21-2019, 11:44 AM

Quote:

Originally Posted by p1l0t

Who tuned your car after the catback?

You don't need a tune for a cat back.

Nevermore · 06-21-2019, 11:51 AM

I lose about 3mpg in the winter, but spring and summer see pretty decent numbers, even on wide/sticky summer tires. If this is bad (I don't know that math) then it definitely seems odd. Even with aggressive driving and bad traffic, any highway commuting puts me in the 30s. Even spirited back road driving returns in the 30s.

PetrolioBenzina · 06-21-2019, 12:25 PM

I'm thrilled with 17 mpg.

mav1178 · 06-21-2019, 12:29 PM

Quote:

Originally Posted by ephemerality

I bought the car and have only swapped out the wheels for forged wheels.

It helps to know what you have done with the car... and what tires you have on there.

Going with wider + stickier tires can plunge your gas mileage by 10-15%.

06-21-2019, 03:02 AM	#1
ephemerality Junior Member Join Date: Mar 2019 Drives: None currently Location: New Zealand Posts: 8 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Worse gas mileage than usual Hey guys, got my GT86 about 4 months ago and just started checking the mileage because I felt that I was visiting the gas station a little too often. I'm getting 8.8 km/litre combined which seems absurd. Everyone I've spoken to IRL gets at least 11-12km/litre. My car is mostly stock with an aftermarket catback, so I have no idea why it is getting such bad mileage. I've cleaned the MAFS and changed the engine oil.. Does anyone know what else to check or how to fix it?

06-21-2019, 03:28 AM	#3
Mr.ac [insert cool phrase here] Join Date: Aug 2015 Drives: BRZ Premium Location: Central Coast CA Posts: 2,369 Thanks: 709 Thanked 1,558 Times in 930 Posts Mentioned: 30 Post(s) Tagged: 0 Thread(s)	What are your driving habits? Checked tire pressure? Is it low? How are you calculating mpg/kml? __________________ New daily driver - Subaru BRZ Premium Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged

06-21-2019, 08:27 AM	#8
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)	Check for intake/vacuum leaks. Also, if you have the means of data logging/monitoring, take a look at your fuel trims. This can tell you if it's running rich. __________________ 2013 WRB "Build" Thread

06-21-2019, 11:51 AM	#12
Nevermore Wayward Member Join Date: May 2012 Drives: Hot Lava 86 Location: Bust of Pallas Posts: 3,336 Thanks: 1,669 Thanked 2,312 Times in 1,386 Posts Mentioned: 50 Post(s) Tagged: 3 Thread(s)	I lose about 3mpg in the winter, but spring and summer see pretty decent numbers, even on wide/sticky summer tires. If this is bad (I don't know that math) then it definitely seems odd. Even with aggressive driving and bad traffic, any highway commuting puts me in the 30s. Even spirited back road driving returns in the 30s. __________________

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Front Driver Side Clunking - Already checked the usual suspects	PandaSPUR	Mechanical Maintenance (Oil, Fluids, Break-In, Servicing)	13	08-24-2018 12:01 PM
What colors compliment Ultramarine besides the usual Bronze/Silver/White.	Ginger Academy	Cosmetic Modification (Interior/Exterior/Lighting)	5	04-08-2016 09:36 PM
Brakes feel 'stiffer' than usual after pumping	1Cor10:23	Suspension \| Chassis \| Brakes -- Sponsored by 949 Racing	3	04-14-2014 01:57 PM
Stock wheels in different colors? (other than the usual black/gold/bronze)	CaptainSlow	Cosmetic Modification (Interior/Exterior/Lighting)	7	04-10-2013 10:03 AM
Business as usual at Scion Canada HQ	colHolm	Scion FR-S / Toyota 86 GT86 General Forum	5	07-04-2012 09:17 PM

06-21-2019, 03:16 AM	#2
p1l0t Senior Member Join Date: Jan 2016 Drives: 2016 Subaru BRZ Hyperblue Location: West Hartford, CT Posts: 8,416 Thanks: 22,575 Thanked 9,371 Times in 4,813 Posts Mentioned: 58 Post(s) Tagged: 1 Thread(s)	I got a 74 Lincoln Mark IV that gets 10 MILES to the GALLON because MURICA. So you're fine. Sent from my SM-G975U using Tapatalk

06-21-2019, 04:11 AM	#5
p1l0t Senior Member Join Date: Jan 2016 Drives: 2016 Subaru BRZ Hyperblue Location: West Hartford, CT Posts: 8,416 Thanks: 22,575 Thanked 9,371 Times in 4,813 Posts Mentioned: 58 Post(s) Tagged: 1 Thread(s)	Who tuned your car after the catback? Sent from my SM-G975U using Tapatalk

06-21-2019, 12:25 PM	#13
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'm thrilled with 17 mpg.

User Name		Remember Me?
Password