MPG in the low 20's w/ stage 1 tune

[NicKoLi]

Hi Guys! I know there are other threads about this but, not really specific to my scenario. Im new to the forum, though I've been looking plenty of things up. I was really hoping someone could help me out. I just bought a 2017 civic si coupe and installed the tsp stage one tune. I just figured out how to show mpg lol and I'm getting in the low 20's. I was running map 2 in sport mode, but even when I turn it down to map one without sport I'm getting in the low 20's to maybe 27 at the most. Any idea of whats going on =( I need help I just learned how to look at the datalog in tuner view also, where do I find my fuel trim under and what should I be looking for? How do I know if my spark plugs are acting up? I checked oxygen and it looked good.

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[suhhh]

Any other mods other than ktuner?

 

[zspeed]

Mine is usually from 27-30mpg ever since I used wider tires with the Hondata tune. When I was using the stock sport hatch tires, I was hitting 32-38mpg even with the Hondata tune.

 

[gtman]

It really depends on how hard you are pushing your car. Basically, at part throttle, mpg's shouldn't be too far from stock. Push it hard and mpg's drop off a cliff.

As an example I've gotten as high as 50 mpg in my non-Si turbo with the TSP tune. When I drive in race car mode, I've gotten as low as 17 mpg.

My guess is the tune is new to you and you're having fun checking out the capabilities. Drive it easy for a few days and see if your mileage looks better.

As far as the fuel trim question, look for STFT and LTFT.

 

[360glitch]

 

[NicKoLi]

Thanks, No other mods so far other than the k tuner. I had a feeling it had to do with my driving but it seemed shockingly low. The weird thing is when I look on the dash I got it to about 27 mpg trying to baby it. On the Trip A mileage is showed like 37 mpg ? Which is it? Thanks for the name of how to look at the fuel trim. What kind of numbers or what should I like to see if everything is normal ? Also should I possibly change my spark plugs or clean my air filter or something, I'm the second owner with 24k on the car. All the previous owner did was like 3 oil changes.

 

[NicKoLi]

Also, I have tuner view on the head unit. When I try and open it on my phone, its asking for me to pay like 5 bucks for some data logger or something. Is this normal what do I do ?

 

[suhhh]

Thanks, No other mods so far other than the k tuner. I had a feeling it had to do with my driving but it seemed shockingly low. The weird thing is when I look on the dash I got it to about 27 mpg trying to baby it. On the Trip A mileage is showed like 37 mpg ? Which is it? Thanks for the name of how to look at the fuel trim. What kind of numbers or what should I like to see if everything is normal ? Also should I possibly change my spark plugs or clean my air filter or something, I'm the second owner with 24k on the car. All the previous owner did was like 3 oil changes.

Hm I honestly don't know, I could be completely wrong but it could be an exhaust leak?

I had a similar problem to you where my MPG was incredibly low and no matter how much I babied it my gas gauge would deplete really quick. Turns out I had an exhaust leak from when I installed my downpipe.

Could be possible previous owner had mods and then parted out and didn't correctly tighten some things... can't say for certain but I guess it could be possible

 

[NicKoLi]

It was a lease, and very very very babied. Everything was completely bone stock and taken care of. Is it possible it takes a while to adjust mpg and im just kinda stepping on it ? I usually shift around 3 or 4k through out the gears. I checked oxygen levels and everything was in the green. Things are tight right now and im really worried, how do I check for an exhaust leak? Or the spark plugs, ect ?

 

[gtman]

Trust me on this. It's your right foot.

Also remember if you're driving more city than highway, mpgs suffer big time. Check your tire pressures. I highly doubt you're having mechanical issues.

If you want though, post a datalog here (in a .zip) and I'll check it out.

 

[disgraced.fk8]

I laughed so hard, kudos on this one

 

[suhhh]

It was a lease, and very very very babied. Everything was completely bone stock and taken care of. Is it possible it takes a while to adjust mpg and im just kinda stepping on it ? I usually shift around 3 or 4k through out the gears. I checked oxygen levels and everything was in the green. Things are tight right now and im really worried, how do I check for an exhaust leak? Or the spark plugs, ect ?

Like the people above me said then it's probably your foot. You definitely would know if you have an exhaust leak, like your gas gauge has to be draining pretty fast. When I was driving with a gas leak I drove about 60-70 miles and half my tank was gone, now that it's fixed I'm using less than a quarter.

Also I wouldn't always say leases are babied unless you know the person, I beat the absolute fuck out of my 2018 si lease before this car

 

[NicKoLi]

I understand thanks for your help. I cant get tunerview to work on my damn phone its making me try and buy something to datalog. Or does it save on the dongle and I can just plug it in my desktop? I dont have a labtop

 

[SDAlexander8]

Idling also kills your mpgs. Do you reset your trip odometer ever?

The average mpg reader will never raise if you have 2000 miles on your trip odometer

 

[gtman]

Idling also kills your mpgs. Do you reset your trip odometer ever?

The average mpg reader will never raise if you have 2000 miles on your trip odometer

Best to set it up so it resets on each fillup.

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