Ok, lately ive been getting absolutely terrible gas mileage! it shows i get 18 miles per gallon!! i think it started happening after i put my new rims and tires on. i recently put 17s on with bfg kdw tires. also my light for the tire pressure sensor is on. could that be the problem?

 

low tire pressure = sucky mileage

do more preventative maintenance

 

winter gas mix

 

did you put the sensors back in the wheels? thats would cause the light to come on.

 

i think the sensors are in there but their not synced... ill try adding some pressure today, see if that helps at all

 

The winter mix gas will net in a 10% or so loss in milage. Keep your tire pressures up, and all the normal jazz

 

whats the winter gas mix?

 

For winter the oil companies make a different mix when they produce the Gasoline. if you really want to know read this

http://epa.gov/otaq/regs/fuels/ostp-3.pdf

 

Are you using your defrost more now than you were prior by chance?

 

nah, its been happening since about september.. im guessing its my intake or rims causing the problem..

 

anything on intake guys? throwin off my maf?

 

Hmm well I thought the mileage difference was due to things like warm up taking longer (richer fuel mixture for longer), and the atmosphere is more dense. More o2=more gas for stoich.

Oh well i could be wrong.

 

Winter mix sucks *****. I used to be at exactly like 30MPG during the summer, now, I'm like 28MPG..

**** blows.

 

28 is about what I get, on the highway driving Cruise control set at 70.

 

if you changed the rim size, the computer is calibrated for a specific size and thats what it goes off of for you fuel mileage computer, soif you changed tire or rim size your computer would be off try calculating it the old fasioned way by filling it up to full, setting the trip, driving it for awile and filling it back up again and dividing it by the mileage you accumulated and the gallons that you had to replace. and see if it ising off a gallon or two? could be and also winter mix gas sucks.

 

If your rim size is off, your Trip/speed/odo wil all be off...
and consequenctly it would be off the same ammount but by a %
So even if you do the fill up reset and math you should STILL get
close to the # on the display.

 

Weird u only get 30 mpg in an ls 2.2 i get about 31 around town and 36-38 on the highway @ 65

 

i was gettin tht on my ride, with the stock rims n such, i cleaned my air filter (dirt dumped out) and changed the plugs and ran higher grade gas and my mileage came back up to where it was before i neglected it for a wile

 

I just got back from a long trip this weekend. I averaged 32.5 mpg on the highway today, with my winter tires. Before I was getting only about 20 mpg, and that's mostly highway going to work. The temps have been warmer (around 32), opposed to the single digits and teens. The bitter cold must really decrease the gas mileage.

 

Of course it does, but it also means a few more HP