I'm going to be
given 
an 05 Civic LX in a week, and was wondering if anyone was willing to help me figure some numbers out..
I already drive extra-conservatively, use P&G and EOC.
Unfortunately, I've never calculated my economy since I shared the vehicle with my mother in the past, and she drove it like a go-kart.
I'm guessing I get about 35-38 MPG city, does that sound about right?
Now, I was recently looking at
a thread for my same car w/a grill block.
If he gets 46mpg highway w/only a grill block, what do ya'll think I would be getting in the city with a grill block, header, intake, exhaust, and springs?
I'm trying to figure out how long it will take for the mods to pay for themselves.
I did a little bit of calculating with 35mpg as my starting point, and 45mpg after the mods.
The mods would pay for themselves after about 3.5 years, but that thread I read leads me to believe I can get better than 45mpg city (with mods and driving techniques).
I'm just looking for guestimates, throw some numbers at me
Thanks
-Josh