sixxers fuel milage running 19s - Mustang Evolution

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Old 03-01-2013, 05:24 PM   #1
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sixxers fuel milage running 19s

i just got the AMRs a week or so ago , loving the look but hate the my new mpg...
i went from around 27 mpg to 21-22 mpg . is this normal, or does it sound like i may have an issue that started aroung the same time ?
i dont drive it any diffrent , and i even try to be easy with it to get back to the 27 mark and the only way i can is if im going down the interstate and reset it .which is not a real avg mpg ....
im pretty sure its the wheels just want some assurance..
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Old 03-01-2013, 05:35 PM   #2
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That's about right if your doing mostly city because I have the rtr wheels and I average about 24-25 if I baby it around town but highway and interstate I still can get around 30 no less than 28.
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Old 03-01-2013, 05:44 PM   #3
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but i can barley get 24-25 on interstate and on the high way and city its 21 22 iv got a CAI roush AB . im hoping i just got low quality gas and ill see a little diffrence next tank .
nice wheels by the way
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Old 03-01-2013, 05:46 PM   #4
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I have 18 AMR's and I average around 18 MPG
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Old 03-01-2013, 05:51 PM   #5
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Dang I didn't know it hurt that bad. I thought the pony pkg runs the bigger wheels and still get the around 30 this wouldst hurt much ....
But I was wrong lol
And do you got any pics of your Stang I'd like to see
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Old 03-01-2013, 06:38 PM   #6
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Do 18s lower mpg over the stock 17s?
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Old 03-01-2013, 06:39 PM   #7
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I know the 19s do big time . But I did get the 10 in wide in the back
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Old 03-01-2013, 06:48 PM   #8
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Perhaps I should rethink getting bigger rims, lol
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Old 03-01-2013, 07:10 PM   #9
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Crap! I just ordered 19" from am. I wasn't aware it would make that much of a difference.
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Old 03-01-2013, 07:11 PM   #10
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Crap! I just ordered 19" from am. I wasn't aware it would make that much of a difference.
Which ones? I really like the GT500 and Foose Speed.
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Old 03-01-2013, 07:12 PM   #11
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So when I get my 18" staggered set up on in the spring, I will notice my mpg drop?
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Old 03-01-2013, 07:30 PM   #12
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Which ones? I really like the GT500 and Foose Speed.
2010 GT premium.

---------- Post added at 09:30 PM ---------- Previous post was at 09:26 PM ----------

I'm getting 12/100km or 19.6 mpg in mostly city, traffic and not much highway driving. I have the stock 17's, how are some of you getting 25-26 in mixed driving? Very early shifting? Help! Going to 19's in a couple of weeks.....scared. lol
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Old 03-01-2013, 07:48 PM   #13
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I have the PP w/ 19 and I get 27-29 mpg.
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Old 03-01-2013, 07:57 PM   #14
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I Have the PP w/ 19 and I get 27-29 mpg.
Not much traffic? Mostly highway driving, or a mix? The tires coming on my new 19s are 245-45-19. From the day I bought it its never changed.12/100kms, 19.6mpg. I do hit traffic as I work down town I hope its because of that. I rarely shift under 3k....maybe that could be a reason also.lol
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Old 03-01-2013, 08:39 PM   #15
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Not much traffic? Mostly highway driving, or a mix? The tires coming on my new 19s are 245-45-19. From the day I bought it its never changed.12/100kms, 19.6mpg. I do hit traffic as I work down town I hope its because of that. I rarely shift under 3k....maybe that could be a reason also.lol

Its a mix of highway and city driving. I shift +/- 3k. I have 255/40/19. i also have 3.31 gears.
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Old 03-01-2013, 09:21 PM   #16
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I usually shift around 2500 when putting around . But now my RPMs stay about 200-300 higher
Running 70mph in 6th gear.
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Old 03-01-2013, 09:57 PM   #17
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Its a mix of highway and city driving. I shift +/- 3k. I have 255/40/19. i also have 3.31 gears.
I don't get y my mileage is poor in comparison? I'm running 2.73 which should also give a fuel advantage. Any answers or suggestions are welcome.
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Old 03-01-2013, 10:09 PM   #18
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Not much traffic? Mostly highway driving, or a mix? The tires coming on my new 19s are 245-45-19. From the day I bought it its never changed.12/100kms, 19.6mpg. I do hit traffic as I work down town I hope its because of that. I rarely shift under 3k....maybe that could be a reason also.lol
This pretty much sums it up, you are getting cities miles and you hot dog it on the rpms. Try slowing down and granny'n the rpms shifting at 2K max. Don't ride someones *** and coast a good distance. You'll see closer to ~24 mpgs then.
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Old 03-01-2013, 10:42 PM   #19
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This pretty much sums it up, you are getting cities miles and you hot dog it on the rpms. Try slowing down and granny'n the rpms shifting at 2K max. Don't ride someones *** and coast a good distance. You'll see closer to ~24 mpgs then.
I agree here. My auto shifts well before 3K when I put around town, as soon as you start getting over 3k rpm most of your gas mileage go's out the window. When ford set the avg mpg rating on these it was with gentle city driving (never getting over 3k probably) and highway would be the same as these cars put along at 70mph in 6th gear without breaking 2500 rpm. I will say that wider & heavier wheels & tire do take more effort for your car to spin but your driving is defiantly the biggest contributor of low mpg as my hybrid tuned auto with 3.73 gears and other various mods gets 25mpg+ average. And I do not granny pedal my car all the time, the solid black 11's around town and the pals over at Orlando speed world can testify to that. (I'm next in the 12's, just wait)

If I were you I would check air pressure (low pressure=more drag) for starters and reset your avg mpg then go easy on it for a few days. If no improvement then swap back to the stock setup for a week and see if your mpg's come back. If not then there may be bigger fish to fry here.
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Old 03-01-2013, 10:46 PM   #20
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It matters about weight, because the heavier they are the harder the motor has to work. Also stickier and wider the tire that gets you worse gas mileage too. Mine only went down maybe 2 mpg and I have 18 inch sve's on 285s
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Old 03-02-2013, 06:37 AM   #21
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Thanks guys, ill change up my driving habits on a tank and see what I get.
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Old 03-02-2013, 12:34 PM   #22
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For this first tank you basically always need to run gas mileage through your head, otherwise your brains going to turn off and default to your existing shift points. I read somewhere that driving habits can affect your MPG by as much as 40%!
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Old 03-04-2013, 03:01 AM   #23
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I don't know how some people are getting such high MPG's
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Old 03-04-2013, 04:55 AM   #24
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On long trips I could get 28-29, around town with about a 50/50 mix I still was getting around 25 MPG. This is with a 2013 Performance package M/T with 3.31 gears. I am still at a constant 25-26.5 with the 225/65 17 winter wheels on my car now.
BTW when I went from the 235/50 18's to 255/45 18's on my 2010 I lost 1 MPG.
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Old 03-04-2013, 04:58 AM   #25
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I don't know how some people are getting such high MPG's
Smart planning...rear gear selection, tire package, and as most have mentioned, driving habits. I have the 3:31 rear gear setup, 18 inch wheels, and average 25 to 26.3 highway miles per gallon. I also recently added the spare tire package (a donut spare) over the can of "fix a flat" due to my comute each day. The added weight did not seem to drop the milage down. I will admit that I keep the crusing RPM's to 2 gtrand; that nets me around 80 MPH on highway cruising. City driving drops me to about 23 MPG; it's a lot of stop go for me in the afternoon rush hour.
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Old 03-05-2013, 12:35 AM   #26
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I have a 2012 v6 auto with 2.73 and I average 22.5mpg. I would say that I drive 30% highway, 60% city and 10% "spirited driving" w/o a care in the world. So i guess Thats actually pretty good gas mileage. But ford shows average should be right around 20 city 31 highway with auto. I dont know wth most of these guys are talkin about. I dont see how you can drive these car like minivans. Should be a crime.
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