Fuel economy for Caravans/Motorhomes

[sprintcyclist]

Bought a magazine today on Caravans and motorhomes.
it has a section on how to improve the fuel economy, in brief here it is (rounded off to 0.5L/100 kms)

1/ Right tyre pressure - 2L/100KM

2/ Tyre size - 1L/100KM

3/ Snorkel - 1L/100KM

4/ Diesel chip - 1L/100KM

5/ Tow Vehicle weight - 2L/100KM

6/ Caravan weight - 4.5L/100KM

7/ Cruising speed - 1.5L/100KM

8/ Aerodynamics - 2L/100KM

Wow, surely these are not cumulative ?

So a vehicle set up badly could use 15L/100kms more than a well set up vehicle?

[Serial Brain 9]

Bought a magazine today on Caravans and motorhomes.
it has a section on how to improve the fuel economy, in brief here it is (rounded off to 0.5L/100 kms)

1/ Right tyre pressure - 2L/100KM

2/ Tyre size - 1L/100KM

3/ Snorkel - 1L/100KM

4/ Diesel chip - 1L/100KM

5/ Tow Vehicle weight - 2L/100KM

6/ Caravan weight - 4.5L/100KM

7/ Cruising speed - 1.5L/100KM

8/ Aerodynamics - 2L/100KM

Wow, surely these are not cumulative ?

So a vehicle set up badly could use 15L/100kms more than a well set up vehicle?

it can depend on the Vehicles engine size/setup along with the Vehicles own weight.

For instance - I pulled our van with one car with a 3lt motor and used 16lts per 100ks at 90kph - lets say on a nice day with low winds.

Pulled the exact some caravan with a different car with a 3lt motor and it used 20lts per 100ks at 90kph

Car Number 2 is bigger and weightier in itself so uses an extra 1lt per 100ks by itself. Put any sort of trailer on it and fuel economy goes out the window.

Fords and Commodores - expect 20lts per 100ks

Some of the 7 speed jeeps have been reporting back excellent fuel economy towing vans but they can often have bugs in them with engine lights continually coming on.