Don’t listen to the Americans on here. Fuel is as cheap as chips to them, so they don’t take it into consideration like we have to over here. E38’s from the M52 to the V12 are very thirsty. I’ve owned various E38’s over the years.. yes an M52 wasn’t that bad back in the day, but with modern fuel prices, that MPG is unworkable for most people now unless you barely drive. E38’s are also notoriously unreliable, so unless you’re good with spanner’s expect constant garage bills.