Bellow
Hardcore MB Enthusiast
Don't know specifically, but as it relates to the LPG having a lower calorific value than petrol, ie less energy per litre, you can calculate a ball park figure.
Google ''Caloric fuel values'' to find a table that has both petrol and LPG (use propane if no specific LPG data) values. They will be in MJ/kg, and the petrol figure will be higher. Divide the petrol figure into the LPG figure - which will give a number less than 1. Now multiply your petrol mpg by that number and that should give you a rough figure to work from.
From memory, I think a 20% drop in mpg is the norm.
PS. For greater accuracy you need to deal in volume, ie litres. The above are by mass ie kg, so will be slightly out.
Google ''Caloric fuel values'' to find a table that has both petrol and LPG (use propane if no specific LPG data) values. They will be in MJ/kg, and the petrol figure will be higher. Divide the petrol figure into the LPG figure - which will give a number less than 1. Now multiply your petrol mpg by that number and that should give you a rough figure to work from.
From memory, I think a 20% drop in mpg is the norm.
PS. For greater accuracy you need to deal in volume, ie litres. The above are by mass ie kg, so will be slightly out.
Stratman
MB Enthusiast
Yup, you will get a lower MPG figure using LPG. The only practical reason for doing the conversion is because LPG is cheaper than petrol.
For now.
It's only cheaper because the Chancellor says so. When diesel was hardly used by Joe Public the duty was much lower than on petrol. It suited the Government because the haulage industry and taxis were the main users and it helped keep inflation down. Then the masses discovered it and HMG wasn't raking in as much duty any more. So up went the cost of diesel to balance the books.
So it will be with LPG. If it becomes a mainstream fuel HMG won't be able to resist the lure of your money.
For now.
It's only cheaper because the Chancellor says so. When diesel was hardly used by Joe Public the duty was much lower than on petrol. It suited the Government because the haulage industry and taxis were the main users and it helped keep inflation down. Then the masses discovered it and HMG wasn't raking in as much duty any more. So up went the cost of diesel to balance the books.
So it will be with LPG. If it becomes a mainstream fuel HMG won't be able to resist the lure of your money.
Bellow
Hardcore MB Enthusiast
Nah... HMG will be too busy trying to figure how to tax electricity for all the electric vehicles about to be unleashed onto our roads to care about LPG!
You are right though. We are subject to their whimsical changes.
