What mileage does your slant six powered ride get?

Not to throw a wrench into the works but a 318 can get just as good mileage as a / if not better . Before 2008-9 manufacturers weren't interested in mileage per se . THE sweet spot for most vehicles was 55 mph and around 1500-1700 rpm with recommended tire size . My 2000 Durango 5.9 Magnum gets 12 mpg on a good day , going down hill with a tail wind . It weighs in @ 5,240 lbs . In contrast my 2018 Ram 5.7 gets 19.4 mpg all day long and weighs 5,450 lbs. MY point is : sometimes a 6 cyl. can get less mileage than a v-8 . Fact : flathead fords only got 8-10 mpg