Valve Spring Recall Affecting Fuel Economy? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jc7993 · 11-06-2019, 11:17 AM

Ever since I got my recall work done, I feel like my average mpg went down. Besides the recall, I had them change out the spark plugs and TOB, nothing else. Has anyone else feel their fuel economy taken a slight hit of a few MPG less?
Is this something that needs to be broken in for the mpg to go back up to where it was?

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8RZ · 11-06-2019, 11:34 AM

Are you going by the car computer only or doing your own calculations?
How long has it been since the recall?

ls1ac · 11-06-2019, 11:35 AM

If you have done nothing else to the engine and are using stock tune it will take a little while for the computer to re learn.

jc7993 · 11-06-2019, 11:36 AM

Quote:

Originally Posted by 8RZ

Are you going by the car computer only or doing your own calculations?
How long has it been since the recall?

Going by the computer average mpg. I usually keep my eye on the fluctuating mpg while I'm driving and I noticed this change. It has been about 300miles since I got it back.

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jc7993 · 11-06-2019, 11:37 AM

Quote:

Originally Posted by ls1ac

If you have done nothing else to the engine and are using stock tune it will take a little while for the computer to re learn.

I have a ots tune before the recall. Do you know if they clear the tune as part of the recall?

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8RZ · 11-06-2019, 11:37 AM

Quote:

Originally Posted by jc7993

Going by the computer average mpg. I usually keep my eye on the fluctuating mpg while I'm driving and I noticed this change. It has been about 300miles since I got it back.

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I think it's too soon to tell, you've only gone 1 tank since the recall. Keep driving and monitoring.

Dadhawk · 11-06-2019, 11:44 AM

Checked my records for the two months before and two months after.

2 months before was 3,836 miles @32.60MPG
2 months after was 3,192 miles @32.64MPG

That included changing out the plugs at 136,000 miles for the first time.

Tcoat · 11-06-2019, 11:46 AM

The weather has got colder since you had the recall done. You will take a small hit in MPG just from that. There should be no impact on MPG from the work they did.

bcj · 11-06-2019, 12:08 PM

When I replaced my battery last spring, the in dash average display went down drastically.
It's finally got back to the pretty solid 33.4 I had before only last month.

You're most likely getting the same mileage.
The computer takes quite a while to creep back up with that 0 still in the data set.

jc7993 · 11-06-2019, 12:21 PM

Quote:

Originally Posted by bcj

When I replaced my battery last spring, the in dash average display went down drastically.
It's finally got back to the pretty solid 33.4 I had before only last month.

You're most likely getting the same mileage.
The computer takes quite a while to creep back up with that 0 still in the data set.

I did noticed that I had to do the EULA agreement all over again on the head unit when I got it back. Maybe they disconnected the battery for a while doing the recall?

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8RZ · 11-06-2019, 12:31 PM

You can always reset your MPG data by holding the button down.

DarkPira7e · 11-06-2019, 12:38 PM

My gas mileage dropped significantly because I started driving the car as if it were new to me - hammering every corner I could find as I had just been re-united with an old friend. Are you certain also that you're not driving differently than before?

jc7993 · 11-06-2019, 12:59 PM

Quote:

Originally Posted by DarkPira7e

My gas mileage dropped significantly because I started driving the car as if it were new to me - hammering every corner I could find as I had just been re-united with an old friend. Are you certain also that you're not driving differently than before?

Haha no I was told not to hammer it for the first thousand miles so I kept it under 4k rpm. It's been hard not to....

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jc7993 · 11-06-2019, 01:00 PM

Quote:

Originally Posted by 8RZ

You can always reset your MPG data by holding the button down.

I think I will reset it and see how I fare. Haven't reset since I got it back from the recall.

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11-06-2019, 11:17 AM	#1
jc7993 Member Join Date: Oct 2018 Drives: Looking to buy Location: New York Posts: 55 Thanks: 20 Thanked 3 Times in 3 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Valve Spring Recall Affecting Fuel Economy? Ever since I got my recall work done, I feel like my average mpg went down. Besides the recall, I had them change out the spark plugs and TOB, nothing else. Has anyone else feel their fuel economy taken a slight hit of a few MPG less? Is this something that needs to be broken in for the mpg to go back up to where it was? Sent from my GM1915 using Tapatalk

11-06-2019, 11:44 AM	#7
Dadhawk 1st86 Driver! Join Date: Feb 2012 Drives: '13 FR-S (#3 of 1st 86) Location: Powder Springs, GA Posts: 19,811 Thanks: 38,817 Thanked 24,937 Times in 11,375 Posts Mentioned: 182 Post(s) Tagged: 4 Thread(s)	Checked my records for the two months before and two months after. 2 months before was 3,836 miles @32.60MPG 2 months after was 3,192 miles @32.64MPG That included changing out the plugs at 136,000 miles for the first time. __________________ Visit my Owner's Journal where I wax philosophic on all things FR-S Post your 86 or see others in front of a(n) (in)famous landmark. What fits in your 86? Show us the "Junk In Your Trunk".

11-06-2019, 11:46 AM	#8
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,283 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	The weather has got colder since you had the recall done. You will take a small hit in MPG just from that. There should be no impact on MPG from the work they did. __________________ Racecar spelled backwards is Racecar, because Racecar.

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11-06-2019, 12:38 PM	#12
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 3,933 Thanks: 3,199 Thanked 4,095 Times in 2,045 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	My gas mileage dropped significantly because I started driving the car as if it were new to me - hammering every corner I could find as I had just been re-united with an old friend. Are you certain also that you're not driving differently than before?

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