Does this seem about right...?

[Gavla]

I drove from London to Coventry in my 86' 325i Cabby.

At 75 miles per hour (speedo) it was at 3000 rpm (speedo) and achieving 28.2 miles per gallon (OBC)

Does this seem normal?

[popey7676]

Rpm seems a little bit high for 75mph

[magpie]

you should have a 3.64 diff fitted so it could be worse or maybe you have a 3.73 or worse still a 3.91

[popey7676]

I think if it was standard it would be a 3.91, for better mpg you would need a 3.64

[Gavla]

I think if it was standard it would be a 3.91, for better mpg you would need a 3.64

It is a standard car, can anyone confirm this...

What mileage difference are we talking about and what other benefits are there if I go to the expense of fitting a 3.64 diff?

[magpie]

my 325i chromie had 3.64 as standard facelifts have 3.91

[daimlerman]

3:64 diff gives 73mph at 3000rpm.

Bear in mind that niether speedo or rev counter will be 100% accurate.

OP's fiqures seem reasonable to me.

[polsta]

seems reasonable to me about right id say, although only real way yo test if to do some regular milage keeping an eye on what your putting in and getting

[e30topless]

IIRC the cabs got a 3.73 ? 28mpg seems pretty good

[Gavla]

Some varied opinions...

I seemed to think the revs were a bit high and mileage a bit low, but in general it seems there is nothing for me to be concerned about.

Thanks for input

[daimlerman]

My cabbie....



Has a home-built 2.7 and a 3:64 diff.
I average about 31mpg most summers.

driving style and road type are the biggest factors regarding mpg,lots of short trips in town will see you use more fuel,my usage is mostly long trips on A roads.