2011 128i vs 2007 328i MPG

[The1]

Originally Posted by Xyloft

sport package on either of them? the sport package has lighter wheels and that actually does make a difference.

I lose 2-3 mpg when i put my winter wheels on every year. they were cheap rims, so you can feel how much heavier they are.

winter fuel mixtures are a little different too, so expect to get worse mileage no matter the tires you have on in the winter.

but wheels and tires do make a difference for sure.

[Tom K.]

Originally Posted by Evice

One another thing is, I believe our engines have a weird efficiency graph. At 61 mph = 34-35 mpg, at 70 mph = 30mpg, at 78mph = 32mpg
Beats me why.

That is somewhat odd although you are closer to the torque peak at 78 in 6th (ca. 75 with the MT and about 81 if Step.).

I assume you've corrected for speedo error & wind.

Tom

[The1]

Originally Posted by Tom K.

That is somewhat odd although you are closer to the torque peak at 78 in 6th (ca. 75 with the MT and about 81 if Step.).

I assume you've corrected for speedo error & wind.

Tom

this would be acurate.... That's how CVT transmissions work, they keep the car in peak torque range for optimal efficiency, the engine isn't working as hard because it's sitting where it is strongest.

[m_thompson]

Originally Posted by Xyloft

I lose 2-3 mpg when i put my winter wheels on every year. they were cheap rims, so you can feel how much heavier they are.

I gain about 2-3 MPG when I put the winter tires on. I suspect that the narrower tires have less rolling resistance.