I finally replaced my clapped-out 1.9 in my 1984 Westfalia with a
barely-used 2.1 and the difference was (to me) spectacular. It pulls up
hills in third gear for which the 1.9 had to use second. In British
Colu,bia where I live, that makes a huge difference. But you lose a bit
on fuel economy, possibly from driving that bit faster.

Stuart