My 7.3 V8 diesel 27ft long mini RV averaged 20 mpg on 2000 mile trip of France last year. We was loaded up for four and carried a minimum of 20 gallons of fresh water for the loo ect and averaged a speed of 60 mph.
Boxer 3 ltr engine 3.5t Autocruise
2000 to Spain 28.5 according to trip computer
Could do better but through France in the winter I tend to toe it to get it over with.
If I keep the speed lower I can get over 30 mpg.
A few years ago back from South of France towin a c*****n with V8 RangeRover.... 9mpg.
New Fiat Panda solo... anywhere between 60 and 90 mpg per tankful depending on where and how fast.
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