Getting better gas mileage after mods

[NeoDragons]

Hello,

After almost 2 years of owning the car, I just wanted post my observations regarding gas mileage from it stock to my current mods. i know other people mileage may vary but this is what i have encounted so far.

1. well for the first couple months of owning the car i was averaging about 32-33mpg, where i live we do alot of stop and go driving/city driving
2. first major mod was installing the Hondata +6 tune. ran it for a couple months and my MPG's stayed roughly the same, about 32-33.
3. a month or two later I installed the PRL DP/FP combo, running that for a couple months my MPG's dropped to about 31 on average.
4. around December of last year was when I installed the PRL Cobra CAI. MPG's improved back up to when i first got the car, back up to 32-33 MPGS
5. at around early in January was when i installed my aftermarket wheels (Enkei's T6S 17*8 40mm, wrappedd in General's Gmax AS05). new set with tires weighed about 44lbs, compared to the stock weight (50.2 lbs) so a savings at about 6lbs a corner. MPG's started to average hight 33's to low 34s'.
6. mid February was when installed both my PRL FMIC and PRL CVT Cooler. as of Feb to today it has continued to climb as of 3/23 , it is currently averaging 36.8 MPG.

Keep in mind my driving habits have stayed the same. i still get on it every once and awhile . i also gas at the same station (Mobil) and gas 91 octane everytime.

Not sure if this information will be relevant to alot of people but i just wanted to share what i have observed so far with my current mods.

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[ZephyrFlash]

Hello,

After almost 2 years of owning the car, I just wanted post my observations regarding gas mileage from it stock to my current mods. i know other people mileage may vary but this is what i have encounted so far.

1. well for the first couple months of owning the car i was averaging about 32-33mpg, where i live we do alot of stop and go driving/city driving
2. first major mod was installing the Hondata +6 tune. ran it for a couple months and my MPG's stayed roughly the same, about 32-33.
3. a month or two later I installed the PRL DP/FP combo, running that for a couple months my MPG's dropped to about 31 on average.
4. around December of last year was when I installed the PRL Cobra CAI. MPG's improved back up to when i first got the car, back up to 32-33 MPGS
5. at around early in January was when i installed my aftermarket wheels (Enkei's T6S 17*8 40mm, wrappedd in General's Gmax AS05). new set with tires weighed about 44lbs, compared to the stock weight (50.2 lbs) so a savings at about 6lbs a corner. MPG's started to average hight 33's to low 34s'.
6. mid February was when installed both my PRL FMIC and PRL CVT Cooler. as of Feb to today it has continued to climb as of 3/23 , it is currently averaging 36.8 MPG.

Keep in mind my driving habits have stayed the same. i still get on it every once and awhile . i also gas at the same station (Mobil) and gas 91 octane everytime.

Not sure if this information will be relevant to alot of people but i just wanted to share what i have observed so far with my current mods.

I think it's absolutely relevant! Thanks for tracking and sharing with us.

 

[gtman]

When I installed my aFe Pro Dry S filter, I got a small bump in MPG. Since adding my +6 Flashpro tune my mileage has gone down a small bit but for obvious reasons. If I'm easy on the gas, my mileage is like it was before. If I gun it, my MPG is way down.

 

[10GenPearlSi]

When I installed my aFe Pro Dry S filter, I got a small bump in MPG. Since adding my +6 Flashpro tune my mileage has gone down a small bit but for obvious reasons. If I'm easy on the gas, my mileage is like it was before. If I gun it, my MPG is way down.

My experience is the same as yours, but with the Ktuner base tunes. It is too early for me to tell, but I am guessing that I will get a little less with the Vittuned Stage 1 tune. It is more robust in general driving and so probably that is due to a little more gas. If it is, it is well worth it to me for the greatly enhanced driving experience it gives me. The real difference is that I have to now run premium gas. That is not an issue for me as I bought this car for spritely performance. It still gets good gas mileage. I hope someone will chime in with some larger data sets on this.

 

[fiend busa]

After owning the car for one year and tuning

MPG dropped from 31mpg to 25mpg

 

[kidcon]

for me it has depended a lot on which mods - when i got mudflaps MPG went down same with my splitter. but my tune didn't change it. my wheels and tires have improved it. so its all dependent on which mods

 

[gtman]

Mods or no mods the biggest factor in MPG is still your right foot. Get those RPM's up high and mileage suffers.

 

[kidcon]

i get around 32mpg and i dont have a light foot

 

[Metal_Hatch]

@NeoDragons when first reading your post I was wondering if weather had anything to do with changes in your MPG. Then I noticed that you're in Guam...boy how I miss the Chamorro Village. Very useful info here, I have to consider getting the CVT cooler for the hotter months here on the east coast.

I just got an oil change/tire rotation as well as a CVT fluid change yesterday, and since then I've noticed that the CVT is much smoother when switching between ratios. I attribute my slightly higher MPG's I've been averaging to this.

 

[NeoDragons]

Then I noticed that you're in Guam...boy how I miss the Chamorro Village. Very useful info here, I have to consider getting the CVT cooler for the hotter months here on the east coast.

ya man, chamorro village still going strong. always have great food

 

[Shankmeyster]

I get 34 mpg average on back and forth to work and some around town. My best was on the way back from L.A. after I got the Thermal R&D exhaust at 44 mpg.

 

[SandyEggoSi]

Thx to the user above that posted about the loss in gas mileage after installing mud flaps. Should be obvious that installing 4 mini "parachutes" will have such an effect, but some people just don't think about those things. A heavier or wider tire will also decrease MPG's and even more so if the offset moves the wheels further outboard. Remember to adjust your math if running taller tires as your loss in MPG may be partly to blame on your speedo/odo not knowing that you mounted different size tires. =)

Splitters, sunroof visors, window visors, hatch glass visors will also affect fuel econ. If you're on the fence about spending the money for a mod, consider this because it just might change your mind when u examine the longer term costs associated with upsetting the aero efficiency of your car.

 

[kidcon]

Thx to the user above that posted about the loss in gas mileage after installing mud flaps. Should be obvious that installing 4 mini "parachutes" will have such an effect, but some people just don't think about those things. A heavier or wider tire will also decrease MPG's and even more so if the offset moves the wheels further outboard. Remember to adjust your math if running taller tires as your loss in MPG may be partly to blame on your speedo/odo not knowing that you mounted different size tires. =)

Splitters, sunroof visors, window visors, hatch glass visors will also affect fuel econ. If you're on the fence about spending the money for a mod, consider this because it just might change your mind when u examine the longer term costs associated with upsetting the aero efficiency of your car.

This! I was trying to explain to my dad how after all the drag I’ve put on my car that I’m getting worse gas mileage because he was complaining about loosing a few mpg after his new wheels - every mod you make the appearance will most likely lower mpg

 

[EdwarDallas]

PRL Stage 1= +2mpg
36 PSI in tires= +.5 mpg

My mileage in my 2020 Si went from 26 to 28mpg+ combined city/highway driving

Edward

 

[IronFusion]

With down and front pipes, E30 in the tank, a custom tune, and wider stickier tires I was still getting 40-55mpg on a highway cruise. I get 22-28mpg on my regular weekly tank now with stock wheels. Terrible road conditions and traffic and drivers. I was getting maybe 28-34mpg bone stock and factory tuned when new.
Ethanol is cheap, the performance is fun, and I can avoid being run over by the fleet of mouth breathing altimas in the area. I'm not going to fret some mpg's when half the koalas and kangaroos are ash. Planet ruined...

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