LostBoyz

I didn't see that part, I had 600 miles on my car in the first 2 weeks, 6000 in 3 months.

Nuke

There really are an incredible number of variables. You simply can't compare one guys (sorry, alkemist) #'s to yours unless you know how close his driving style and conditions match yours.

Until an engine warms up, it's very, very inefficient. Average fuel mileage is just that; an average. If you drive your car 1/2 of the distance in stop-n-go traffic you may get 8 mpg and the other 1/2 of the distance highway where you may get 30 MPG. You can see the average is below 20 MPG.

I'd still check the typical things, keep your records and see what happens when we return to the summer fuels before I begin doing anything costly. You're #'s are low but may be easily accounted for if you look in the right places.

jreask

I am driving a '09 GT with 3.55's. Brenspeed 93 octane tune with Ford Racing CAI. I get constant 22 MPG combined highway and city. If I retune to 87 Octane, my mileage drops to around 20.5 MPG. FWIW

snaf2u

When people say "mixed driving" without telling the percentage of city, rural and highway the statement doesn`t tell you much at all.

I can truthfully say I can get 28 mpg mixed driving, 22 mpg mixed driving or 18 mpg mixed. It all depends on the mix.

As Nuke said, it is almost impossible to compare using any figures, let alone mixed.

Go get a fillup near a highway, take a long highway ride and fill again near the highway. Check the milage manually. Record the temp., altitude, % of level road, and headwind and it will still be tough to compare but at least wou will have solid data.

Not an easy problem to solve on a forum.

JimmyM

Yeah, I have many short-distance drives. I don't think I've driven continuously for over 30 minutes except on a very few rare occasions. Most of my drives are around 15 minutes to reach a destination (restaurant, friend's home, etc.) and then drive back maybe two/three hours later.

And waiting for warmer temperature sounds good. I guess I won't start to panic yet - not that this is really something to panic about. But as I said, it has more to do with the regret factor, particularly to justify my purchase of the V6. 87 octane just hit $3.45 tonight, so I suppose that's some comfort.

Thanks, everyone

bmwlover0725

Winter additives in gas are bad for mileage, but you live in CA so I don't know how much of that they do. I have a 2011 V6 and if I really try, I can get about 22 average with a 30-70 city-highway mix during winter. Summer I get around 24 if I try with the same driving. I can get close to 30 if I'm on the highway on a trip, but usually I drive hard everywhere I go so I average about what you're getting. If you're driving it normally or slightly harder, you'll get below 20. I don't want to think what I would be getting in a GT500

bmwlover0725

I wish I saw that before I posted. I beat you! 14k in 6 months

Slug Catcher

Is it just me, or is driving around at 1000-1200 RPM lugging it a bit???


Im not real sure what the new engines power band is?

MythEyeLess

Heavy Foot?

JimmyM

Yeah, that's what I was recently told. I was driving at 40 at 1k RPM in 6th.

What are the harmful effects of lugging the engine? Poor MPG? Shorter lifespan? Inefficiency in future?