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

IS-F Gas Mileage?

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Old 02-24-17 | 11:56 PM
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Default Terrible mpg?

Okay, I do about 85% city, 15% highway

​​​​​​I'm mostly in normal D. Hardly WOT, and I'm averaging 12.5-13.3 MPG. I calculated it by dividing trip mileage with gallon of gas used since last fil up. So it's as accurate as it'll get. Why is it so much lower than the suggested 15mpg city? Any ideas?
Old 02-25-17 | 12:07 AM
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Cuz wider tires equals more rolling resistance
Old 02-25-17 | 12:21 PM
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Originally Posted by KraziAzn
Okay, I do about 85% city, 15% highway

​​​​​​I'm mostly in normal D. Hardly WOT, and I'm averaging 12.5-13.3 MPG. I calculated it by dividing trip mileage with gallon of gas used since last fil up. So it's as accurate as it'll get. Why is it so much lower than the suggested 15mpg city? Any ideas?
That's what I get now unless I am on a long trip. Short trips around the neighborhood are terrible for gas mileage.
Old 02-25-17 | 12:31 PM
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Originally Posted by lobuxracer
That's what I get now unless I am on a long trip. Short trips around the neighborhood are terrible for gas mileage.
Ditto. Spirited or normal driving I'll return 14-16 mpg so might as well enjoy a few WOT runs
Old 02-25-17 | 01:05 PM
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Originally Posted by ROYALISF
Ditto. Spirited or normal driving I'll return 14-16 mpg so might as well enjoy a few WOT runs
agreed. So I'm like eh, might as well drive like I want
Old 02-25-17 | 02:37 PM
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The weirdest thing I've found. If I drive around with the transmission in normal my gas mileage suffers. In sport I'm actually getting better gas mileage.
Old 02-25-17 | 03:37 PM
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I'm geting around 210 to 220 miles on a tank, 100% city, on winters 18s square setup. 2 weeks ago I told myself that I'll use "snow mode" after filling her up , for a full tank of gas to see the mileage I'll get. I can say that my milage increased by 10% with just few harder accelerations but no redlining. But man, that was hard not to push that beast. I'm pretty sure that on this tank I'll will loose my 10% gain plus another 30% to feed my withdrawal lol!! Never again.
Old 02-26-17 | 08:39 AM
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I get about 245 miles per tank all city. Around 16-17 mpg. Highway is significantly better.
Old 02-26-17 | 12:48 PM
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Originally Posted by ultimase
The weirdest thing I've found. If I drive around with the transmission in normal my gas mileage suffers. In sport I'm actually getting better gas mileage.
I actually tried sports mode and the MPG is now at 15ish!
Old 02-26-17 | 05:47 PM
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Originally Posted by KraziAzn
I actually tried sports mode and the MPG is now at 15ish!
My next full tank I'll give this a shot as well!
Old 02-26-17 | 07:23 PM
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According to the computer I avg 20.5 MPG nearly every tank, usually make it to 275 miles before yellow light comes on. I do maybe 75% highway. Pretty happy on the few longer trips I've done solid 25-27mpg. Pretty happy with my DD choice.
Old 02-26-17 | 08:18 PM
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Originally Posted by LexusfanVA
According to the computer I avg 20.5 MPG nearly every tank, usually make it to 275 miles before yellow light comes on. I do maybe 75% highway. Pretty happy on the few longer trips I've done solid 25-27mpg. Pretty happy with my DD choice.
That's about what I got when I commuted 20 miles each way to work. I work from home now and the only long trips I make are to customers out of state or to the airport about 42 miles from here. Short local trips (<5 miles) and I see 13.5 - 14.5 mpg all the time.
Old 02-26-17 | 11:03 PM
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My beater is my truck - only get 15, 16 on that. The F sees mostly freeway, and always between 20 and 21.

Lou
Old 03-02-17 | 10:17 AM
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50 /50 city 18mpg
Old 03-02-17 | 10:21 AM
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any input on guys with rr tune? netter mpg?



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