What Fuel
I have a 407 with a 318 engine, slightly up on the 313 on rebuild with leadfree heads, cleaned up exhaust ports and manifolds. I always use either Shell V=Power or if I cannot get it BP Optima. In Ireland I always carry copious quantities of Castrol additive.
Difficult to tell if it does as advertised more mpg but I seem to average 17.5 mpg.
Had the car 25 years and until it disappeared many years ran it on leaded 5*
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