You're completely right. My consumption is about 1 litre per 17 kilometers. In September recently (made some photographs) I can see I managed 504,2 km with a calculated consumption of 17,567 liters pro km after filling up. (=41,4 mpg) At that point the warningt light is lit for more than 50 km. I mostly refuel somewhere between 400-450 km. Maybe it helps I've an EV too......!
Regarding the space, yes, I have that plastic panel under my spare wheel too. My Morgan is equipped with the "lockable space" in the rear board, just enough for some paperwork, and two safety vests. Not really worth the money...!
So you have to adept, but we are experienced Morgan travellers...!!
