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Discussion Starter · #1 ·
Well I've been reading a lot and finally decided to put she'll 93 in my car to see if it will improve not only in power but in milage and stop running soo rich . It's only a few weeks old and the tailpipe gets unreal dirty . Which tells me it's trying not to knock as I've experienced with past turbo cars . Kia does not state exactly what to run only a min of 87 and also from experience a lot of times the gas does not carry that full octane . Well fingers crossed
 

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I put a tank of 91 (stupid cali) shell in mine and have yet to notice a difference with it from what I normally run. You may get better mpg and power but I think the black is still going to be there on the exhaust. Even my SUV has black on the tips and I run 91 in it. May just be a cali thing for emissions crap but not sure lol
 

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Discussion Starter · #3 ·
I'll give it two tanks and compare the milage to see if I get past 24 mpg . So far it ran a 0-60 ,6.64 so no real difference in acceleration But the engine is a lot quieter for some reason . After the last blast run I did notice a change though . I'll see again in the morning . Possibly the ecu has to fully readjust . I like the shell because it runs hydrogen as the additive in their v power
 
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That's crazy you can't get over 24mpg. Is that city or hwy? I get on the hwy around 33-34 and city is about 25-26.....sometimes :p
 

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Discussion Starter · #6 ·
I drive s little of both . But it may be I'm a bit heavy footed . I'd be happy averaging 29 . I never have the car in Eco mode though . I hate the way the forte's drive with it on . Maybe also the cars on the western side of the country get better gas milage as I have seen in the past . Could be the tune could be the gas itself . I got 33 though when I drove it upstate on the 87 . About a 400 mile round trip . Filled up on 366 miles
 

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I feel like most of you get a lot lower MPG than I do. I'm all city and the lowest I've seen is 26. That was last winter when it did a lot of idling to defrost. Lately I've been averaging over 32. I noticed around a 2 mpg increase switching to 91 from 87.
 

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I have a little over 4K miles on the odo. I drive a mix of 65%/35% city to hwy. My average miles per hour according to the trip computer A is 30 MPH. The average miles per Gallon according to the trip computer says 28 MPG but dividing miles on the tank (244 miles) by tank fill up (9.5 gallons) gives me only 25.6 MPG. The trip computer always shows a higher MPG than what I calculate.

What is your average MPH (shown on trip A) if you are getting over 30 MPG? I rarely go WOT.
 

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I'll have to check but last I remember looking it was 25mph average. I'm also in a manual tend to shift into 6th quickly and skip some gears when just putting around. I have the gear shift indicator turned on and am usually shifting at or before the indicated points.
 

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Discussion Starter · #10 ·
I forgot to add the worst of it . I live in the mountains so driving up a lot hills . I drove my ex that got an average of 28 to wildwood New Jersey that is super flat . The gas milage shot up to 38 mpg . That's probably why it's soo bad . But I've still never seen the low of 21 so that's s really good thing
 

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Discussion Starter · #11 ·
well after the first tank done . I'm going back to 87. I see no gain in performance at all. and the gas mileage is actually worse . On a stock tune I think its better just to stay with 87 or 89. May have been 93 was just a bit too high over 91, but since no gains at all not worth the extra 6$
 
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Just wondering if you unhooked the battery for a few minutes? I think these cars have adaptive learning. So any time you change anything on the car, it's reconmended to unhook the battery to reset the system.

Sent from my SM-G900W8 using Tapatalk
 

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Even stock I saw a difference between 87 and 91. You do have to give it a few tanks to adapt to the new fuel. Once I ran the crap the dealer put in out I have ran 91 all the time and only ran 87 through 3 tanks to see if it worked different
 

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Discussion Starter · #14 ·
I did not . I've heard of the adaptive learning . But being a 2016 I didn't want to try . I'll wait a few months to see what others are having results with . But I'm planning of getting tuned in the spring so not too much in a rush . when I did put 87 back in though the difference was very noticeable . The car is quicker and more responsive now . So it is possible it sensed the change and threw the ECM into some kind of limp mode. The MPG also went back up
 

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Probably because of not resetting the ecu to learn the new fuel. Either way good find on what the difference is between the two with a 16. My 15 hates 87 lol
 

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I'm on my second tank of 93 which I just went to since its recommended to prevent lspi. I would agree on my 15 there seems to be a little less power and slightly less mpg than 87. But temps have also gotten cooler so hard to say.

Would have to dyno and see whether it actually advances timing to take advantage of it. I'm guessing it's just placebo effect and butt dyno needing calibration though.
 

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Damn nice number. .... all I get is around 18 or 19 nothing highter.... highest I went was 24 MPG and that's when I drive like a granny going 25 or 30.... but on the highway I do normal driving 70-80 MPH ... how can I get better MPG I used to use 91 octane but switched to 93... and after the first days of owning the car the reader went from 303 to 273 and now I get a full tank on 244 range... am I doing something wrong ... also no ECO mode
 

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If you havent already, replacing your spark plug has done wonders for other people on this forum
But I only have 3,500 miles on it
 

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Haven't made any changes to mine. Just 1100 miles on it. I'm noticing a running 30mpg average on 87 and 29mpg on 93.

I'm guessing it's largely driving style. I'm liberal with the gas pedal when accelerating but I drive to avoid braking as much as possible. As that's where you turn your gas spent energy from momentum to useless heat at the brakes. Downshift for a little engine braking as approaching lights, keep a good following distance and don't accelerate when you're just going to have to brake up ahead, etc.
 
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