How many miles are you getting per tank and what MPG?

suhhh

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Current: 2020 Civic Si Coupe Past: 2018 Civic Si Coupe, 2014 Prius, 2013 Civic LX 5spd
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Curious to see the numbers some people are getting, seen varying numbers online and also from my personal experience with driving a 2018 Si, 2020 Si, both modified and stock.

What year civic: 2020 Civic Si

Average MPG: 26-27 mpg

Mostly highway/city/mixed: Mixed

Which octane gas do you use: 91

Engine Modifications: FKX Catless downpipe

Driving Habit: Fairly spirited, semi heavy foot





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lradicoSI

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Louis
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New Jersey
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2017 Honda Civic SI
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What year civic: 2017 Si

Average MPG: 30mpg

Mostly highway/city/mixed: 50/50 highway/city

Which octane gas do you use: 93

Modifications: Stock

Driving Habit: Rip on it when I can
 

Memogiyi

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Guillermo
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Mission Hills
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2017 Honda Civic Si
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What year civic: 2017 Civic Si

Average MPG: 27mpg

Mostly highway/city/mixed: 80% city now and 20% hwy

Which octane gas do you use: 91

Modifications: Borla Catback exhaust/K&N drop in filter

Driving Habit: Spirited driving
 
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Sxcrates

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Socrates Molano
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San Diego
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2018 Civic Si Sedan
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What year civic: 2018 Si

Average MPG: 32mpg

Mostly highway/city/mixed: 50/50 highway/city

Which octane gas do you use: 91

Modifications: 27won Intake, Greddy SP Exhaust

Driving Habit:
calm footed until I hit on ramps or empty roads.
 

DmK

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USA
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Honda Civic SI
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What year civic: 2020 Civic Si

Average MPG: 36-39mpg

Mostly highway/city/mixed: Most highway

Which octane gas do you use: 93

Engine Modifications: TSP 1

Driving Habit: occasionally spirited
 

fabrizzio71

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Matthew
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United States
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2018 Civic SI Coupe White Orchid Pearl
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What year Civic: 2018 Si coupe

Avg. MPG: 33-37 mpg

Type of Miles: Mixed-back roads, highway, city

Octane Level: 93 octane

Mods: AEM drop in filter, TSP stage 1

Driving Style: Fast-moderately aggressive at times.
 

GlahdoSI

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California
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2019 Civic Si Coupe
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What year civic: 2019 Si

Avg mpg: 30-34 depending on how fast

type of miles: Highway only

octane:91

mods: Prl street maf, Plm downpipe frontpipe, Ktuner V.1 do not use the sport mode every day

driving style: spirited
 

PdxJose

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Jose
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Oregon
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2020 Civic Si Coupe
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What year civic: 2020 Civic Si

Average MPG: 32-35

Mostly highway/city/mixed: Mixed

Which octane gas do you use: 91

Modifications: Catback exhaust

Driving Habit: calm footed, occasionally spirited
 

jst4fun17

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Geoff
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Alabama
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2017 Civic Si Coupe
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What year civic: 2017 Coupe Si

Average MPG: 39-41

Mostly highway/city/mixed: Hwy.

Which octane gas do you use: 89

Modifications: K&N CAI

Driving Habit: 78 cruise control on I-20. 97 miles one way to work.
 

Jonmd89

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Jon
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Florida
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2019 civic si
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What year civic: 2019 Si

Average MPG: 34 mpg

Mostly highway/city/mixed: 80% city (45mph in 6th gear is our cars sweet spot at like 50 mpg)

Which octane gas do you use: 93

Modifications: Prl race cai, Megan catless downpipe, depo intercooler/piping, tsp stage 1 tune

Driving Habit: Rip on it up to speed and then mostly just hoping I catch a red light
 

Funjeff

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Concord, Ca.
Car(s)
2020 Civic Si Coupe
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What year civic: 2020 Civic Si Coupe

Average MPG: 29-30mpg

Mostly highway/city/mixed: Mixed

Which octane gas do you use: 91

Engine Modifications: Bone stock

Driving Habit: Spirited

Only 1200 miles on clock
 

Hazzard

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GA
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2020 Civic Si
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What year civic: 2020 Civic Si Sedan

Average MPG: 32-35mpg

Mostly highway/city/mixed: Mixed

Which octane gas do you use: 93

Engine Modifications: Bone stock

Driving Habit: occasionally spirited

only 2,200 on the clock
 

REBELXSi

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What year civic: 2018 Civic Si

Average MPG: 35-36mpg (average overall per oil change interval)

Mostly highway/city/mixed: 70/30 hwy/city

Which octane gas do you use: 93

Engine Modifications: PRL Cobra Street CAI and dual 23psi Ktuner base map

Driving Habit: Lots of highway cruising at 60-65mph and then tearing up back roads.

Been getting high 40's and even 50 mpg+ on my commutes to work lately.

Here you see my commutes to work...

IMG_20200617_173524_209.jpg


and here you see the Jekyll and Hyde like mileage I get between highway cruising and WOT pulls
20200618_070905.jpg
 
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leasedsi

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Michael Bova
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Miami,Florida
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Honda Civic Si Coupe 2019
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What year civic: 2019 Civic Si

Average MPG: 21-23 mpg

Mostly highway/city/mixed: Mixed

Which octane gas do you use: 91

Engine Modifications: Intake, Custom Tune

Driving Habit: Very Spirited!


I will admit when i drive 2-3k RPM only i get 34MPG with the tune. but i barely drive like that lmao.
 

MediumUnwell

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Ryan
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Utah (Utah County)
Car(s)
2018 Civic Si Sedan, 2013 Civic EX-L, 2012 Odyssey EX-L (the wife's)
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What year civic: 2018 Civic Si

Average MPG: 31-36 mpg

Mostly highway/city/mixed: 50/50

Which octane gas do you use: 91 (highest they sell in Utah)

Engine Modifications: PRL CAI (street maf) Kutner + TSP stage 1 Tune

Driving Habit: MIx of spirited and conservative driving.

If I leave it on the base tune I can get 36mpg on about 50/50 hwy/city. If I leave on the middle tune, I get about 32-34 for that same mix depending on how hard I push it. I usually don't leave it on the highest tune for an entire tank, I use that just when I want some extra performance. I've had one completely hwy tank and left it on the lowest tune and got over 40mpg but as this is my daily driver I usually always have that 50/50 mix.
 

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