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I think it would be interesting to have some people post here with the modifications they have done to their car and the resulting gas mileage. There have been a lot of conversations about whether or not modifications add or decrease MPG. Also, with the mileage, try to think about whether your foot has gotten 'heavier' since you got that intake, because that may be the reason for a decrease in gas mileage. I was mainly wondering if anyone has noticed an increase as drastic as the one I have. Maybe we can see a trend if enough people add. Anyway, here goes nothing:

2002 EX coupe, manual trans, k&n FIPK II, Magnaflow cat-back, Megan Racing header, lowered 1.5"

Gas Mileage: 34 city, 40 highway

 
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Atleast one person on here got increased highway mpg with a turbo.

 
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2001 LX 5-speed K&N Typhoon, NGK Iridiums, lowered 1.5," 205/45/17s, and I get about 30city/40 highway, which is no better or worse than I got when this thing was stock.

 
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01 LX 5-speed, injen SRI, spoon catback and I'm seeing the same or about 10% gain in highway mpg.

 
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05 Ex 5 spd, AEM V2 and RSR Exmag catback, otherwise bone-stock. Driving is nearly 50/50 city/hwy. Avged 35 mpg before, 36 mpg after.

 
Rep Power: 259

205-40-17's Lightweight rims, 33 city 41 hwy

 
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Since your speedo is off like 4% due to your tires, are you taking that into consideration?

 
Rep Power: 425

6 PSI = +4 MPG across the board (assuming minimal foolery)

 
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i have race header, no cat, magnaflow cat back, throttle body spacer, ported and polished throttle body, AEM CAI, lowered with eibach prokit, i am hitting 38 mpg all city under 40 mph, driving normal.

 
Rep Power: 287

Lx 5 spd. = 215/45/17, Magnaflow catback, and 2 12s and got 38 on highway and around 34-36 in the city....but I just got a K&N filter so I'm waiting see if it makes a diff.

 
Rep Power: 281

K20A swap SCed 35 freeway, 28 city

 
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LOL
Beasterd!

 
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Thanks i try

 
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01 ex 2 dr auto. with greddy evo 2 exhaust, k&n stock filter replacement 195 60 15 tires , i think, i got about 380 miles out of a tank of gas, not all the way empty but just before the gas light would come on, so not sure if that is good or not...

also how are you figuring out your mpg?

 
Rep Power: 264

02 LX manual

205/45/17' Konig Imagine (prob the only thing that actually uses up most of my gas) AEM SRI, REVO SS, Type R Grill EM2 Crew sticker(this too) and other goodies...

damn mods i got....so much damn hp so little MPG

10 hwy 4city

ps jk....i can go 2 weeks without filling my tank (starting full) driving 20 miles everyday 40 each day avrge...and somedays 50 miles more for random places friends house, cruisn etc...

 
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2004 SUbaru Impreza WRX WORX 4-way adjustable blow off valve...19 city/ 29 highway

 
Rep Power: 264

see mods below... avg 430miles a tank soo 38/43