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[mantaray]

I have just fitted an LPG kit to my Omega and used it on gas for the first time today, everything is working fine but I was surprised to see that the inst. and average fuel consumption functions on the trip Comp were both working. As I expected the trip consumption and Range were not registering as I was not using any petrol.

My question is where do the feeds for the consumption come from? Also is the inst. and average consumption registering gas usage when on gas?

[Doctor Gollum]

In a nutshell...The engine and abs ecus.

The engine ecu knows what the injector duration is along with the fuel flow rate (system is set at 3.5 bar), and the abs gives speed/distance. 

[dave the builder]

Probably the same electronic DEVIL who lives in the auto gearbox and changes gears when your not even pressing the clutch or wiggling the gear-stick about 

I thought it worked off the amount of fuel the tank level sensor is registering and calculates (based on previous and current driving / MPG ,fuel pulses ,RPM etc) how far you can go RANGE before you hand over a fist full of twenties at the petrol station 

must be a sensor in the seat too to detect how fat your wallet is and adjusts the RANGE to slim your wallet to within selected tolerances (skint/empty)

I'm sure someone far more knowledgeable will be along shortly     
Ah
The Good Doc has replied   

In a nutshell...The engine and abs ecus.

The engine ecu knows what the injector duration is along with the fuel flow rate (system is set at 3.5 bar), and the abs gives speed/distance. 

that then 

still think there's a sensor in the driver seat though 

[mantaray]

In a nutshell...The engine and abs ecus.

The engine ecu knows what the injector duration is along with the fuel flow rate (system is set at 3.5 bar), and the abs gives speed/distance. 

So is the inst. and average consumption registering gas usage when on gas? If it is then I'm well pleased as I did not expect that.

I thought it worked off the amount of fuel the tank level sensor is registering and calculates (based on previous and current driving / MPG ,fuel pulses ,RPM etc) how far you can go RANGE before you hand over a fist full of twenties at the petrol station 

I believe that is true, which is why the Range does not change when changing between petrol and gas.

My seat sensor must be faulty, it thinks my wallet is fatter than it is.

[Doctor Gollum]

In a nutshell...The engine and abs ecus.

The engine ecu knows what the injector duration is along with the fuel flow rate (system is set at 3.5 bar), and the abs gives speed/distance. 

So is the inst. and average consumption registering gas usage when on gas? If it is then I'm well pleased as I did not expect that.

Yes and no.

It thinks it is registering petrol usage from the injector times, but what it doesn't allow for is the volume of lpg being injected as this is different to petrol for any given duration, so the numbers will be out aiui

[mantaray]

In a nutshell...The engine and abs ecus.

The engine ecu knows what the injector duration is along with the fuel flow rate (system is set at 3.5 bar), and the abs gives speed/distance. 

So is the inst. and average consumption registering gas usage when on gas? If it is then I'm well pleased as I did not expect that.

Yes and no.

It thinks it is registering petrol usage from the injector times, but what it doesn't allow for is the volume of lpg being injected as this is different to petrol for any given duration, so the numbers will be out aiui

Right, that makes sense.
Oh well, thought it was too good to be true, just have to work out mph on gas the old way.

Going away with the caravan next week, so will be interesting to see how the cost/mile works out on gas against petrol. Towing the van using petrol, I am getting about 4 miles/litre, which works out at about 29p/mile

[zirk]

On a LPG conversion all the Computer Functions will work as on Petrol except the Range, it will try and calcalate but after a while will be all over the place giving you false info.

The only exception are Factory Fit ones as they share the same Fuel caculations on both Petrol and LPG on the Car