Put a chunk of 2 X 4 between the pedal and the floor.

Other than that just the basics, avoid jackrabit starts, add an extra 2 pounds of air to the tires, avoid long warmups, keep it in tune with clean air filter, reduce your highway speed, etc.

All counterintuitive when you have a V8.

__________________
1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes