ukadamwest
Well-Known Member
check tyre pressure, when was the gearbox oild and filter last done.. diff oil ?
anything that gives resistance through the transmission and drivetrain will affect efficiency. as will the gold bars in your boot
check tyre pressure, when was the gearbox oild and filter last done.. diff oil ?
anything that gives resistance through the transmission and drivetrain will affect efficiency. as will the gold bars in your boot
Wazzajnr
Well-Known Member
I seem to recall reading somewhere that the average is a rolling average over a set number of miles so if it was doing predominantly long journeys then over the limited averaging miles is now into the short journeys, that could explain the sudden drop.
On mine, the readout gives around 17 on crappy hillly Czech roads and is actually doing about 15.5 when measured.
On the long motorway run mainly at 80mph the readout is just over 20 but actual is about 22mpg.
You need to do a brim to brim at same time as a reset before you start panicking about it being wrong.
Do it before a long run then also before a period of short runs and you'll get an idea where you are then.
On mine, the readout gives around 17 on crappy hillly Czech roads and is actually doing about 15.5 when measured.
On the long motorway run mainly at 80mph the readout is just over 20 but actual is about 22mpg.
You need to do a brim to brim at same time as a reset before you start panicking about it being wrong.
Do it before a long run then also before a period of short runs and you'll get an idea where you are then.
Gearbox oil hasnt been done for a while I admit, well about 60k
Same for diffs
Gold bars were eaten last week
Diffs need to be done more often that that by far. I do mine every 10k.
Better do them over Xmas then ty Grrrrr
I have measured over short journeys and long ones inc motorway and still much lower than it has been for the previous three years.
Never done a brim to brim as not really interested in actual mpg, it is just the sudden change that is puzzling
I have measured over short journeys and long ones inc motorway and still much lower than it has been for the previous three years.
Never done a brim to brim as not really interested in actual mpg, it is just the sudden change that is puzzling
Datatek
Well-Known Member
A binding brake is a common cause.
