Really low gas mileage

[Uncle Russ]

At 65 mph on the highway with top down & no AC, my M got 30 mpg. At 3000 rpm (about 78 mph in 6th gear) with the top up and AC on, I got about 27 mpg on level ground and 25 mpg in hilly terrain. In stop-n-go traffic, I was getting 20 mpg.

[wasupdu]

Been AVERAGING 30.1 mpg over the last 6,250 miles in my 3.0 (with new plugs) since I took my car out of storage in mid-April. I've had 2 ~400 mile highway trips and 85% of my drive to/from work is highway, but I'm fairly heavy on the pedal.

My modified Yamaha R1 gets 38 mpg average and the Mercedes CLS63 is at about 17.5mpg

[NJ-Eric]

Originally Posted by krusty

I get about 15 ltr per 100/km (which also happens to be about 15 mpg:
http://calculator-converter.com/l_10...per_100_km.php
)

Same on both Z4 coupes I've owned. Mostly do short distances ...

It must be the short distances. How short? I've never gotten less than 23 mpg in my '07 Si. My daily commute is a serene 15 mile round trip.

-Eric

[WestCDA]

On about a 25/75 mix of highway and city driving, I normally show around 8.4 liters per 100km. For imperial gallons, that's around 34 MPG. For US gallons, that's around 28 MPG. I only run premium fuel.

That's in a 3.0si roadster. I accelerate at a relatively brisk rate, but with the torque this engine has I do usually shift fairly low (3500 RPM or so) unless I have a need to wind it out.

No complaints on fuel mileage for me - I'm very happy with this kind of power and economy of operation.

[GP20]

I do frequent +130-mile drives from Seattle to Vancouver, Canada, and usually get 27mpg in my Z4MC going about 3~5mph above the speed limit. In the winter, it still gets about 25.5~26 mpg.

My old Z4M-roadster used to get 29mpg doing the same Vancouver-Seattle trips. I'm not sure how it did it. I had the same wheels, suspensions, etc, and it wasn't that much lighter than my Z4MC. I could never reach 29mpg in my M-coupe. My '03 2.5i got about 30mpg. My '04 3.0i got about 33mpg.