What E34 gets best gas mileage?

[Scott E]

Parked and with the engine off I assume... lol

[Paul in NZ]

from surveys we have had on the board the 540 quite often is better than the 535.....

What about the 540ia. Is the worst than the 535ia

[Tiger]

17 city and about 25 highway

[dca]

It is more responsive on low rpm, m50 is 24 valve engine, m20 is 12 valve(on previous post I was wrong, I tried to say 12valves ). so it respond gas better than m50 when rpm is low(torque is available on lower rpms), so you dont need to downshift. but on high engine speeds it is weak, that is why m50 is accelerating better when car is moving fast.

[epp]

my e34 does 5.2km/lit (OBC and manual readout similar) roughly 19lit/100km on 93 octane. all stock and loves all the petrol she can take.

rgds,
ed
90/535ia

[jplacson]

Hmm...maybe I just have a heavy foot! hehehehe.

I'm running 225/45 R18 Dunlops (they came with the car, I'm upgrading to Michelins when they need changing)

I just got my car out from Inspection 2 at the dealers. Air & fuel filters were changed, oil (Castrol) was changed as well... spark plugs were still ok, so they didn't change those. Valves were adjusted as well (or so they say anyway) A/C is always on (I live in a VERY tropical country)

I will try to clean my injectors, check the O2 sensor, and my AF meter.

Thanks.

I'm running 95 octane fuel.

[dca]

ofcourse if it is not running, if it is running milage is worst, infinity consumption/per mile.

[TheGeak]

the ///M5 did about 16city/25highway. if i was really light footed i could get about 28-29 highway. But who drives an M5 with a light foot?

[jplacson]

I have 205/65/15 pirelli winter tires which has more drifting than all weather tires. I am sure that I can have better milage with 195/65/15 orginal tires.there should be enough air inside your tires as well.

I'm running 225/45/18s (36psi all around)... would this increase or decrease my milage? What effects would high performance tires have on milage and why? (Sorry for all the questions... new Bimmer owner... never was a gear head, so all these things are quite new to me)

[TheGeak]

proper tire pressure ensures that you have the optimal part of the tire in contact with the road. underinflated tires provide a lot more surface area to come in contact with the road, thus increasing friction, and reducing MPG. If you just make sure you have your tires filled to what it says on the sidewall you should be getting optimal mileage. Make sure to check monthly though, and as temperatures change drastically!

can't help you all that much with the 'types of tires' vs 'mpg' question though. I have a few ideas, but i'm not sure if they're correct or not.