Weird silly question from me again...
 

I just lowered my car like really low, on BC coils.. But the thing now is I drive in the city and my miles per gallon got really low compared to what it used to be. I would think that my Mpg would be better if anything due to the aerodynamics and less draft under the vehicle.. The only thing i could think that would effect it is the wheel alignment needs to be done.. but before i do it i want to know if that is the reason or should i just put back on stock suspension..

PS; On the highway its around the same miles per gallon as it used to be

Do an alignment a few check your psi

Aerodynamiclly, if it was to have an effect it would be at higher highway speeds, not in the city. Could be a change in driving style, are you more careful at bumps and curbs, do you drive slower or brake at road conditions you would have earlier just "sailed" over?

How hard are you hitting the go pedal now that you did Remus + Xpipe dude.

It's not from the Bc could lol

Lol I drive the same , I drove with the xpipe for a month or so, and the mileage didn't start dropping until I put in the coils last week, as far as bumps yeah I dodge them more .. I kinda thought the body weight was more down on the ground which would cause the car the drag and leave me with worse mpg

What's the mpg difference?

Keep in mind it also did cool down alot the past few days... Here in long island and nyc the high is barely above 32F today. Thats probably why.

:iagree: Cold start tire pressure will be decrease as the temperature drops. Lower tire pressure decreases mileage. Depending on how cold it is, the tires will gain pressure after some number of miles and speed. I would increase tire pressure by 3-4 lbs. and see if that helps. In cold weather the engine will run richer especially with a cold start. Could simply be the gas. Have you checked more than one tank and are you buying from the same location? As previously asked--how much has your mileage changed?

I don't expect alignment to be the cause but any change in vehicle height changes the alignment so you do need have it aligned at the new height regardless.

If your alignment is off your tires can be fighting against each other, dramatically reducing their efficiency.

Not sure what your def is of efficiency but the reason I don't think the cause is alignment is because mpg is only less for city driving.