First Hwy Run... Fuel Economy Report - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

PNW FRS · 06-07-2013, 02:05 AM

Finally got around to doing a a highway drive that lasted just over an hour.

Conditions: Dry, temps in mid-70's / 4700 miles on ODO / Only mod is a K&N drop-in air filter and a spoiler for looks.

72 miles / ~60-65 minute drive -- both ways

Average MPG based on car computer
W/O A/C: 37.7
w/ A/C: 34.5

Mostly with cruise control on... leg #2 (w/ air on) had to deal with some traffic... a few roll-ons to 80'ish.

Notable: I really liked how the FRS -- while on flat sections in 6th gear @ about 3.1K on Tach... smoothly (and quickly) got up to 80'ish mph for dealing with traffic. Rig tracks nicely... love the sound coming out of the engine compartment.

As noted in numerous posts... the upper regions of RPM is the place to be... dang hard not to smile...

velin86 · 06-07-2013, 03:06 AM

cool.

Freeman · 06-07-2013, 11:01 AM

31,000 revs? either a typo or you did some magic.

Brndn704 · 06-07-2013, 11:15 AM

Quote:

Originally Posted by Freeman

31,000 revs? either a typo or you did some magic.

I'm pretty sure he meant 3,100. You can use common sense for that.

Freeman · 06-07-2013, 11:20 AM

Quote:

Originally Posted by Logical

I'm pretty sure he meant 3,100. You can use common sense for that.

....or i can have a little fun...... dont be a party pooper

Brndn704 · 06-07-2013, 11:25 AM

Quote:

Originally Posted by Freeman

....or i can have a little fun...... dont be a party pooper

Freeman · 06-07-2013, 11:27 AM

Quote:

Originally Posted by Logical

hahaha i love that cat

gily25 · 06-07-2013, 11:30 AM

I recently did a 300 mile round trip all highway (only engine mod, Apexi drop-in), slightly higher speeds than OP 75-80mph w/ ac for the whole duration. I ended up with the same 34 mpg. I'm going on a limb and saying the speed matters less if you're able to keep a consistent rate of speed during the trip.

Honestly this was my one reason for justifying the purchase of a lightweight car (gas savings), it just happened to come in a sports car package with a few extra smiles, "mpg with style" eat that accord and elantra.

Bt216 · 06-07-2013, 01:54 PM

I average 38 doing 60mph.. the direct fuel injection does save gas. My first tank average was 32mpg

CAMBAM_6 · 06-07-2013, 01:58 PM

So using A/C does lower mpg? I thought that was a myth

DeeezNuuuts83 · 06-07-2013, 02:04 PM

^ He said that he did a few "roll ons" to 80 mph (which I assume to mean quick, brisk acceleration). On a trip as short as 72 miles (which is about two gallons of fuel, give or take), that may very well have accounted for the difference in fuel economy. That and how the pump at the station is set to shut off.

FRyeS · 06-07-2013, 02:07 PM

Quote:

So using A/C does lower mpg? I thought that was a myth

I'm pretty sure it does lower MPG. But i also think "they say" that it is more efficient at highway speed to be windows up/air on than windows down because of the increased drag.

I could be totally wrong, but I believe I got that from somewhere reliable some time ago, havent done my own research

Wo6M · 06-07-2013, 02:31 PM

Hello everyone, the decrease in MPG with a/c on is correct.

The reason this happens is because iof the added load on the engine .
When the a/c button is pressed the magnetic clutch is engaged to allod power flow from the engine to the compressor and ultimately moving the freeon .
The system a high and low pressure sensors that the a/c control modual monitors to determine if the system needs to be turned off or on. The system is turned off at WOT and when desired cabin temp is achived.
I feel tyota has built a very well designed system that is easy to use and maximizes mpg while not sacrificing performance.

I hope this helps.

Dadhawk · 06-07-2013, 02:43 PM

A/C makes a difference but I don't think it would make that much a difference.

What isn't mentioned (or if it was I missed it) in the OP is whether or not both legs were on the same/similar terrain. That could also account for the difference.

If you go to my Owner's Journal I have all my mileage there documented by tankful. Looking through it I don't see a significant difference between winter months (no A/C) and summer months (A/C all the time).

June/July/August, I averaged 31.76MPG with all A/C all the time. Dec/Jan/Feb I averaged 32.58 with no A/C. 90% of my driving is done on the same roads at the same time of day in both occasions. There would have been a difference in fuel mix (summer vs winter blend).

06-07-2013, 02:05 AM	#1
PNW FRS Senior Member Join Date: Sep 2012 Drives: 2013 Scion FR-S Location: Olympia, WA Posts: 581 Thanks: 230 Thanked 343 Times in 189 Posts Mentioned: 7 Post(s) Tagged: 1 Thread(s)	First Hwy Run... Fuel Economy Report Finally got around to doing a a highway drive that lasted just over an hour. Conditions: Dry, temps in mid-70's / 4700 miles on ODO / Only mod is a K&N drop-in air filter and a spoiler for looks. 72 miles / ~60-65 minute drive -- both ways Average MPG based on car computer W/O A/C: 37.7 w/ A/C: 34.5 Mostly with cruise control on... leg #2 (w/ air on) had to deal with some traffic... a few roll-ons to 80'ish. Notable: I really liked how the FRS -- while on flat sections in 6th gear @ about 3.1K on Tach... smoothly (and quickly) got up to 80'ish mph for dealing with traffic. Rig tracks nicely... love the sound coming out of the engine compartment. As noted in numerous posts... the upper regions of RPM is the place to be... dang hard not to smile... __________________ 2013 Asphalt / MT Olympia, Washington Last edited by PNW FRS; 06-08-2013 at 11:18 AM.

06-07-2013, 02:31 PM	#13
Wo6M Keep Calm And Drift On~ Join Date: May 2013 Drives: Scion FR-S WhiteOut 6 Speed Manual Location: Boca Raton ,FL Posts: 268 Thanks: 202 Thanked 114 Times in 61 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Hello everyone, the decrease in MPG with a/c on is correct. The reason this happens is because iof the added load on the engine . When the a/c button is pressed the magnetic clutch is engaged to allod power flow from the engine to the compressor and ultimately moving the freeon . The system a high and low pressure sensors that the a/c control modual monitors to determine if the system needs to be turned off or on. The system is turned off at WOT and when desired cabin temp is achived. I feel tyota has built a very well designed system that is easy to use and maximizes mpg while not sacrificing performance. I hope this helps. __________________ 2013 Scion FR-S White Out Six Speed Manual Name: Deava Mods:

06-07-2013, 02:43 PM	#14
Dadhawk Senior Member Join Date: Feb 2012 Drives: '13 FR-S (#3 of 1st 86) Location: Powder Springs, GA Posts: 20,081 Thanks: 39,599 Thanked 25,401 Times in 11,581 Posts Mentioned: 187 Post(s) Tagged: 4 Thread(s)	A/C makes a difference but I don't think it would make that much a difference. What isn't mentioned (or if it was I missed it) in the OP is whether or not both legs were on the same/similar terrain. That could also account for the difference. If you go to my Owner's Journal I have all my mileage there documented by tankful. Looking through it I don't see a significant difference between winter months (no A/C) and summer months (A/C all the time). June/July/August, I averaged 31.76MPG with all A/C all the time. Dec/Jan/Feb I averaged 32.58 with no A/C. 90% of my driving is done on the same roads at the same time of day in both occasions. There would have been a difference in fuel mix (summer vs winter blend). __________________ Olivia 05/03/2012 - 01/06/2024. 231,146 glorious miles. 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".

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06-07-2013, 03:06 AM	#2
velin86 Senior Member Join Date: May 2013 Drives: 2013 Raven FRS 6MT Location: Bay Area, CA Posts: 112 Thanks: 10 Thanked 19 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	cool.

06-07-2013, 11:30 AM	#8
gily25 Senior Member Join Date: Aug 2012 Drives: Silica BRZ 6MT Location: 06103 Posts: 650 Thanks: 97 Thanked 115 Times in 92 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I recently did a 300 mile round trip all highway (only engine mod, Apexi drop-in), slightly higher speeds than OP 75-80mph w/ ac for the whole duration. I ended up with the same 34 mpg. I'm going on a limb and saying the speed matters less if you're able to keep a consistent rate of speed during the trip. Honestly this was my one reason for justifying the purchase of a lightweight car (gas savings), it just happened to come in a sports car package with a few extra smiles, "mpg with style" eat that accord and elantra.

06-07-2013, 01:54 PM	#9
Bt216 Senior Member Join Date: May 2013 Drives: Scion frs Location: Cleveland,oh Posts: 99 Thanks: 0 Thanked 26 Times in 15 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I average 38 doing 60mph.. the direct fuel injection does save gas. My first tank average was 32mpg

06-07-2013, 02:04 PM	#11
DeeezNuuuts83 Senior Member Join Date: Apr 2012 Drives: 2006 Evo IX SE Location: Southern California Posts: 997 Thanks: 115 Thanked 254 Times in 170 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	^ He said that he did a few "roll ons" to 80 mph (which I assume to mean quick, brisk acceleration). On a trip as short as 72 miles (which is about two gallons of fuel, give or take), that may very well have accounted for the difference in fuel economy. That and how the pump at the station is set to shut off.

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