JimmyM

Long story short, my 2011 V6 PP is getting less MPG than many others with the same set up. I consciously drove conservatively on my last tank hoping to see an increase in MPG, but no dice.

What are some possible (mechanical) causes for lower MPG? My car has 1200 miles so it -should- be broken in.

Thanks.

Fifthwind

What are your numbers?
What is the "set up" you mentioned?
What are the numbers "that others are getting" that you are using as a comparison?
What is a typical daily drive for you?
Are you calculating the MPG yourself after fill-up, or are you reading the OBC number?

We can start from there.

A 2011 V6 automatic, is rated at 19city and 31highway. But, that is a little misleading. The highway mileage is based on a rolling 60mph to a rolling 60mph over distance. In the real world, we have to actually get up to speed, and we tend to go 75mph. So the "real-world" expectation on the highway (for daily commute, not crosscountry) is more along the lines of 26 mph. Combine that with running around for groceries and what-not and a tank will probably get you about 22mph. If you don't do much highway driving, then it could be as low as 16-20mph.

*On-Board-Computers are notorious for bumping the numbers on the high-side. Use a calculator and run the numbers yourself at the pump on your next fill-up for a dead-accurate measurement.

My 05 GT *can* get 29mpg if I drive 100 miles at 60mph on cruise control. But who actually does that? At 75mph, it drops to about 24mpg. That's a big difference, if I was really expecting what the window sticker said.

Nuke

There are many, many variables:

1. driving habits/style (obviously)
2. weather conditions (head-wind resistance, colder weather causes longer warm-ups, snowey roads, fuel changes. see #4)
3. tire pressure (tires lose ~1 PSI per 10 degree F ambient temp drop)
4. fuel quality (addition of ethanol, "winter blend"...)
5. dragging brakes/riding the brake
6. road surface
7. engine efficiency (misfiring plug, A/F problem, exhaust or intake restriction)

...just to list a few.

What are your numbers now and prior to the problem? What changes or repairs have you made? How many tanks of gas from how many different suppliers since you've seen the drop?

LostBoyz

I get 20mpg now that I only drive around town, when I lived further from work I would average 26mpg with about a 30/70 mix of city/highway. I did get 29mpg on my drive back from missouri after a memorial day roadtrip. Cops were everywhere so I just had my cruise set for 70 and sat back and relaxed on a 13 hour drive.

I have 2011 v6 3.31 6MT

Falcon Fixer

2011 GT here.
I get 27-30 at 60.
I average 20-23.

Alec

Have you checked/replaced the fuel filter recently? I was getting terrible mileage over the summer and turns out mine was filthy

Edit: I see you only have 1200 miles so this should be irrelevant

alkemist

There are too many variable as mentioned above. Comparing MPG's with others can be depressing as such unless you know for a fact that you were getting this and now it's that.

If you have an auto, the MPG will generally be even lower compared to a manual.

Don't have a 2011, but I know that I get 18 suburban driving and 22 Highway. If those numbers are off, then they will raise a flag for me.

LostBoyz

The new automatics are rated higher than the manuals, most new cars are this way

alkemist

Unless that was within the last 4 years, I don't see it with my GT. Also to clarify, I meant that with the stang. Not auto's in general.

LostBoyz

from fueleconomy.gov



Most new transmissions (made within last couple years), are comparable if not better than manuals because they can program shift points better than you.