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That is the Fuel CONSUMPTION gauge (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by moots on November 04, 1999 at 06:53:16:

In Reply to: 5-speed owners, does your car do this? (Wierd...) posted by Tim Collins on November 04, 1999 at 00:40:10:

That little gauge below the tach shows fuel consumption.Mine shows Litres/100 km.
1.Car stationary.Engine idle.Gauge will show max deflection to the right(max fuel consumption coz gas is being burned but car not going no where,no distance covered)
2.Car coasting,say at 100 km/h.Gear neutral and engine idle.Gauge will show max deflection to the left(min fuel consumption coz gas is burned at an idle engine speed but distance being covered is at the max)
Makes sense doesn't it!!!

moots '90 520i

: Ok, maybe I just have NO IDEA what the hell I'm talking about when it comes to car engines, but I've noticed a strange behaviour. Say I'm driving @ 40 MPH. I take it out of gear, and leave it in neutral, so it's just cruising and idling. I would think that the mpg needle would show the top, because I'm using just enough gas to keep a 700 RPM idle and going like 40 MPH, no? It doesn't. It is high, but not at the top. But if I have it in gear and just let completely off the gas, it DOES go to the top (highest MPG, no actual #). Why? Isn't it using more gas to maintain, say a 2500 RPM idle (if I leave it in 3rd) than a 700 RPM in neutral? So shouldn't neutral, 700 RPMs give me better mileage? I just find this really strange... can someone please explain this to me?!

: Thanks!

: Tim Collins
: '90 535i 5-speed sharked

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