So my gas mileage on my 08 sedan has been horrible. It's showing up on my dash to be 9.8 mpg
I drive for very short intervals, maybe 5-6 minutes tops local on a daily basis, and i don't even go really hard on the gas. I know short intervals (especially local) give you bad gas mileage, but 9.8 is just ridiculous.....any input?

 

You got a V12 under there?

 

thats seriously bad man. I've been driving my car pretty hard after I installed exhaust and intake and my worst was 15mpg(all city).
Have you calculated it manually? Reset trip to 0, fill up gas tank, drive for a few days, then fill up gas tank to full. divide total miles driven by how much gallons you've put in your tank.

 

Short intervals are known to provide absolutely horrible MPG in our cars.

Reset the counter and take a nice leisurely ride down some main roads for a while.
You should see increases on highway roads. If not, something is up, but I'm guessing it's your short commute that's doing it.

 

I would get that checked out ASAP. I live and work on a Military base 5 mile to work and I do that back and forth 4 times a day plus any other BK, or walmart runs. Lowest I've ever seen is 17. Something is definitely wrong. I would do it manually to confirm that reading is accurate though. I did it the first few times on mine and found out the trip computer is dead on with the MPG.

 

Dude I've had 8mpg at one point in my 07 2nd gen Sport. -_-
I have a heavy foot and do a lot of local driving.(Then again my stupid RPM jumps when I'm driving for some reason) anyways, lately I've been babying it and I hit the highway the other day for work and it went up to 11.0 mpg.

So try cruising down a freeway or something

 

my commute to work is 5 minutes and I take lots of short interval trips back and forth from work and the gym. I'm getting 20 MPG with a 6MT

 

10 MPG doesn't seem right under any conditions

 

If your doing short intervals and leaving your car idle to warm up

I can see that kind of MPG

 

^ aren't you supposed to do that? Not letting you're car warm up makes it worse

 

5 miles? is that all city driving? your car is not getting warmed up at all. You can always take the bus to work if your worried about MPG's

 

Short distance cold weather idling for minutes and winter gas would deffinitely do it.

 

Yep, and BTW it just takes 30 seconds for the oil and other fluids to get circulated, warming up a car is an overused term that means nothing IMHO

Of course I'm not talking Alaska cold here. A vehicle will reach its normal operating temperature a lot faster by driving it, as oposed to sitting there in the driveway at idle.

 

60 seconds is a good bit of time to allow for all fluids to have circulated before you drive. no need to go more than that unless its way below freezing imo.

 

yeah driving will reach its temp faster every morning when i get up to go drop my wife off i like it idle for like 30seconds to a min and then head on my way and by the time im 2 blocks away the car is good