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My 87 Diplomat was running a 318 with a 600 cfm Edelbrock carb, MP ignition, A833 and 2.94 SG rear. Got 25 mpg highway regularly, on regular.
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Our Main Man "dmerc" has been there and done it. 
25 plus mpg out of a small block stroker in a Duster.
I got 25mpg in the valiant's first version...1-2 mpg better than the original 318 did.
Basic stuff too...basic 360, basic heads w/ 1.88 valves and 3 angle valve job, MP 268 .455 cam, eddy performer, holley 600, MP ignition, headers through 833 OD manual trans and 2.94 gears. Ran 14.2 in the 1/4 and when driven easily (60-65mph) would pull down terrific mileage.
1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph
1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD)
1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD)
1989 Shelby CSX #500/500
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