What mods have improved your mpg?

[Xat1cZ]

Nah, then you have more drag from the open top.

I noticed a 2-3 mpg decrease when I did it to my nice, rare E30 Touring that needed some cosmetic restoration.

I only left a small hole for me to fit in , all other open space was welded shut.

[iamsam]

[mikeedler]

air up your tires and run stocker skinny tires.

[325ix]

This is me :(. But it's hard not to lean into it all the time. Seeing i do drive a 383 stroker daily... But i do get 16mpg with city driving and a little highway tossed in there!

I'm the same way in my 540.

[antil33t]

The broken car mod, currently gets Infinite miles to the kilometer.

[mikeb23ft]

I replaced all of my ignition components and added a chip, all in the same day, and noticed a nice increase in mpg.

[Kevinxkrazy]

bikes run on fat and save you money.
cars run on money and make you fat.

[CabbE30]

what engine is this?

1991 m20b25

[tonerrrr]

Don't fill your tank unless needed (lots of weight there).

[gtarwiz]

bikes run on fat and save you money.
cars run on money and make you fat.

[Wild Ride]

Maintain as much momentum as possible through turns and look down the road to anticipate stops and lane blockages.

An m20b25 Mark d chip and 17# injectors netted me 1-2 mpg as the engine is running closer to optimum than stock with more low end power.

My stroker m20gets 2-3mpg better than the more stock car because it makes more torque so I short shift and can pull in 5th rather than downshift. Plus I drive the cars hard so it doesn't phase this engine as much to keep a higher pace. Probably explains why I got worse gas mileage in a 4 cyl 114hp Volvo (rated 28 highway) 17 vs 23 average.

This video explains it:

http://www.youtube.com/watch?v=Tpc0vjAx2gs&feature=youtube_gdata_player

[Stanley Rockafella]

For when gas prices go back up I've thought about super fuel miser mode: 175/75-14s and a taller diff, although I think the dark side will win out and it's eventually going to wind up slammed on 15x8s and retired from commuter duty.

Actually it's 175/70/14 and OH boy does it help fuel economy! it also reduces road noise (in my application as my Kumho's are noisey as hell). Not to mention road imperfections are greatly muffled too.

Tho the other awesome thing I enjoy is in ANY light rain or moisture on the road will cause the car to easily drift! You really gotta stay on monitoring how hard you accelerating, as the back end will break out when driving in daily traffic and attempting to accelerate briskly from a rolling start. Honestly, I don't mind as I can easily keep this old gal in between the lines ;)

[Wild Ride]

175s are great in a straight line but they keep you from maintaining all your momentum in a turn like r comps will.

[jw 325ic]

Moar low and is lip helps

This. Plus new fuel filter and slightly taller tires.

[Wishno87]

2.79 diff. Keeps me out of VANOS on the freeway.