Thank you to everyone that submitted their data!!

 

I guess I should tell you guys what my setup is...

Current Mileage:_45,000
Current MPG (miles per gallon):16-17combined city/highway
Undertray (Y/N):__Y___ If Y, stock or aftermarket?:__Stock___
Rear Diffuser (Y/N):__N__
Mudflaps (Y/N):__Y__
Splitter (Y/N):__N___
Canards (Y/N):__N____
Wing (Y/N):__Y____ if Y, stock or aftermarket?:___Stock___
Full flat bottom on car (Y/N):__N___
Fuel:__92___
Aftermarket Cams (Y/N):__N_____
Aftermarket turbo (Y/N):___N____
Size tires:___255/40R17_____
Approx HP on current tune?:___300___

Mods:
Apexi Intake, Manual boost controller, turbo back 3" Exhaust


Based on the amazing (at least to me) numbers that some people are telling me here, I am starting to think that I need to make sure that I do not have any boost leaks and then maybe replace spark plugs and get a re-tune....I change the oil every 3,000 miles with Mobil 1 10W30 Syn and replaced my air filter at the 30,000 mile service. I live in Seattle, so not too much dust around here..

Also on the topic of the magnets on the fuel lines: it is a very unscientific approach to scoff at something because you do not understand how it would work. To form an opinion you would either have to prove that it did, or that it didn't work....or have evidence that someone had done so.


Thanks again for all the info everyone. Part of my reason for asking was to determine if I was getting a hit in mileage due to my mudflaps. I have read a bunch of aerodynamics or road cars technical papers and reports that talked about the increased drag that would be seen from forcing an airstream out perpendicular to the airstream flowing over the car (as is being done by the mudflaps). But based on the info that people have given, I don't think that is what is going on in my case.

I also wondered if my mileage could be due to my tires' size, but this winter when I was on my winter tires (235/45R17) I only saw a slight improvement...sometimes...so I attributed the improvements to days with colder, denser air...

 

1. Quality tune Last time my car was tuned was a couple years ago...I might have to see if English Racing can sort me out..
2. Quality regular maintenance I do my own maintenance religiously
3. Driving style I drive differently all of the time...sometimes I baby it and sometimes I blow the dust out of the turbo. Honestly though, I have gotten better mileage out of a tank when I took my car to the track and flogged it than out of a tank where I tried to never boost.
4. Topography in your area Most of my daily driving is in what I would consider to be a flat area

 

It's kind of tongue-in-cheek

You have to look at my sig; my Evo is a race car-only so that's why my mileage is what it is.....

 

Okay that makes a bit more sense. I was sitting here thinking "dude that is messed up".


Thanks for clearing that up.

 

interesting data in here. As an aspiring engineer myself, I am trying to develop a formula for an appropriately priced evo as a function of year and mileage as a parametric function