IS F (2008-2014) Discussion topics related to the IS F model

What "mode" gives you best gas mileage?

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Old 07-17-15, 09:59 AM
  #31  
mr2dave
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About 27 highway, 16 and some change in the city. Mild driving style.
Old 07-17-15, 11:54 AM
  #32  
Justind27
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Glad to see some at what I'm now getting (17 mpg, due to is350 diff swap) I miss the mileage from stock but the car is a lot more fun with a lsd and stupid acceleration from gearing swap
Old 07-17-15, 01:08 PM
  #33  
fearnight
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15mpg is definitely not normal. I've averaged 21.5mpg over the last 5000 miles. This includes a lot of heavy-footed driving. Here is my Fuelly log:
http://www.fuelly.com/car/lexus/is_f...arnight/330598

My "mode" approach is pretty simple:
  • General city driving < 55mph - normal mode, D
  • Highway / interstate driving > 55mph - sport mode, D
  • Curvy road / Hooning - sport mode, Manual
I find the car responds a lot better in Sport mode at highway speeds. You can ease into the throttle to accelerate without the need to downshift. I've noticed when I use normal mode on the highway, it has a tendency to downshift a lot more, and burn more gas.
Old 07-17-15, 04:10 PM
  #34  
SubOrbital
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^Sport mode has a sharper throttle map from what I've seen, so you don't press the pedal as hard compared to normal mode when requesting the same amount of torque. Too much throttle position and you downshift per the programming, which explains what you've experienced.

I get about 15mpg city and the only highway I do is rush hour. I'm rather throttle happy as well.
Old 07-17-15, 05:03 PM
  #35  
MileHIFcar
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I've had my car about 6 weeks or so and have been averaging about 21mpg. Considering how I drive the car I think overall that's pretty damn good for the power of the F!
Old 07-17-15, 09:47 PM
  #36  
V8Lex
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Originally Posted by Isflamez
wow 22? when i purchased the car the dash meter was at 7! I thought 15 was making progress lol
The guys at the dealership must of been having a lot of fun with it to get 7mpg
Old 07-17-15, 10:00 PM
  #37  
SubOrbital
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Originally Posted by V8Lex
The guys at the dealership must of been having a lot of fun with it to get 7mpg
Must be common, mine was delivered with 7mpg average as well.
Old 07-18-15, 12:35 AM
  #38  
kiryu
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Happened to fill up today and took on a highway drive of 60 miles...average 27-28 if no AC, 26-27 with AC.75-80mph. This car has very decent highway mpg.

All local driving will get you close to 15-16 depending if the AC is on.
Old 07-18-15, 05:10 AM
  #39  
ISFRC51
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Just got the car 3 weeks ago. Sport and Manual mode, 40% city 60% highway = 22mpg. Driving conservative with a couple of short bursts a day.
Old 07-18-15, 10:00 PM
  #40  
minator
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grandma mode
Old 07-18-15, 10:59 PM
  #41  
bnizzle87
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Originally Posted by fearnight
15mpg is definitely not normal. I've averaged 21.5mpg over the last 5000 miles. This includes a lot of heavy-footed driving. Here is my Fuelly log:
http://www.fuelly.com/car/lexus/is_f...arnight/330598

My "mode" approach is pretty simple:
  • General city driving < 55mph - normal mode, D
  • Highway / interstate driving > 55mph - sport mode, D
  • Curvy road / Hooning - sport mode, Manual
I find the car responds a lot better in Sport mode at highway speeds. You can ease into the throttle to accelerate without the need to downshift. I've noticed when I use normal mode on the highway, it has a tendency to downshift a lot more, and burn more gas.
I'm more impressed and envious at your gas prices. Such a drastic difference in comparison to CA's ridiculous price gouging these last few months.

As for myself, I average around 18 MPG city (60%), 24 highway (40%). I don't really use the different driving modes to help with gas economy. Almost all the time, I'm in SPORT mode and just do the necessary throttling to keep up with traffic
Old 07-19-15, 02:14 AM
  #42  
I8ABMR
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Originally Posted by Isflamez
my commute is 60 miles round trip per day, all highway, dont get me wrong i WOT every soo often but 85% of the time im babying the car. And im fillling my car up every 3rd day or so. is that normal?
The tank is tiny. Really really tiny. Its annoying coming from an LS460 but have just gotten used to more stops at the gas station. Luckily I can at least get 5 days of driving with my commute
Old 07-19-15, 11:15 AM
  #43  
SubOrbital
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Originally Posted by I8ABMR
The tank is tiny. Really really tiny. Its annoying coming from an LS460 but have just gotten used to more stops at the gas station. Luckily I can at least get 5 days of driving with my commute
17gal is rather standard for a subcompact sedan.
Old 07-20-15, 04:30 PM
  #44  
teamcalvin
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I avg 25 highway, and 19 street.. Pretty reasonable if you ask me.
Old 07-21-15, 05:48 PM
  #45  
fearnight
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Originally Posted by bnizzle87
I'm more impressed and envious at your gas prices. Such a drastic difference in comparison to CA's ridiculous price gouging these last few months.

As for myself, I average around 18 MPG city (60%), 24 highway (40%). I don't really use the different driving modes to help with gas economy. Almost all the time, I'm in SPORT mode and just do the necessary throttling to keep up with traffic
Yeah, our gas prices are very reasonable compared to CA. All my prices are Shell Premium (now Nitro+) as well. I never get the cheap stuff; top tier only

Last edited by fearnight; 07-21-15 at 05:52 PM.


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