Poor gas mileage

[ImBetterDude]

2015 RS2 w roush phase 2 kit FBO and custom tune. Drive the car way softer than you'd expect. M6.

I'm averaging 14 to 15 mpg. If not a product of spirited driving, what might be why my mpg is that low? Maybe it's normal? Idk new to the s550 game.

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[NightmareMoon]

I get about 14 mpg in city driving. Its normal.

if you wanted good gas mileage, shoulda bought the ecoboost.

 

[LxMike]

City, Highway?? Hilly commute? Do you start car and sit there or drive off immediately?

Do you do the limit or 5-10 over?? Do you let it rev or short shift?? You said custom tune. e-85 or premium gas?

 

[Alberto]

I get about 11 in my 2019. I've only had it up to 120mph once, but I love stopping the piss out of it in 1st and 2nd gear

 

[fmc_smt]

2015 procharged, 2018 intake , 1050 id injectors , custom tune , 91 octane (Arizona has crappie fuel ) 16Oz of bustane to a tank . I have a light right foot most of the time 16 city 24 hwy . And if your going off your message center , make sure you reset it after you fill up . It figures fuel millage on averages . So the longer you go on not resetting it the lower your milage will show . Has to do with refresh rates in the IPC .

 

[NightmareMoon]

2015 procharged, 2018 intake , 1050 id injectors , custom tune , 91 octane (Arizona has crappie fuel ) 16Oz of bustane to a tank . I have a light right foot most of the time 16 city 24 hwy . And if your going off your message center , make sure you reset it after you fill up . It figures fuel millage on averages . So the longer you go on not resetting it the lower your milage will show . Has to do with refresh rates in the IPC .

not quite.. The predictive miles remaining does go off averages, but isn't affected by resetting the trip odometer or various mileage displays. Its still guessing off your last 100-200 miles of driving or so. Take the car to a race track and it will continue to underestimate your future gas mileage for a tank or so of gas, even if you reset those pages.

 

[FreePenguin]

I get about 14 mpg in city driving. Its normal.

if you wanted good gas mileage, shoulda bought the ecoboost.

eco wins this one.

 

[Elp_jc]

I get 16+ in the city driven normally, and that's with short trips. Not babying it, but not driving like a maniac either. Supercharged is a different animal. Cross your fingers fuel prices don't go to the roof again .

 

[m3incorp]

I drive mine spiritely and get about 10-12 mpg in town. Interstated cruising at 80 mph gets me about 20 mpg.

 

[Louk]

2019 bullitt avg 20-21 in my 16 with headers and tune was about the same.

 

[Drewgamer]

TLDR: Sounds pretty normal for city/town driving where you are stopping semi-frequently.

2020 GT manual here, bone stock (not even PP) and I average probably around 15 MPG around the "city" (it's not stop/go but there are a lot of traffic lights and stop signs).

My gauge says my average is 19 MPG, but it's the highway where you're going to get the good MPG (I think I was averaging about 30 MPG at 70 MPH). Once you go above that the MPG starts dropping again. At 85 I think I was closer to 20 MPG.

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