Wtb mopar daily driver

What could I realistically get for MPG with a slant 6 whether in an older truck or an a-body? As black bomber said it would be sensible driving.

got a nice 02 ram 4.7 5 speed gets about 18 /22 hwy 3800.00 obo a 2000 ram 1500 with 80000 miles loaded with all clean black tk 17x9 indy pace wheels 5.2 17 /20 hwy 6000. obo mike what about my 67 dart gt ragtop