Both my 5.0's got better fuel economy than both my 2.3's.
88LX 2.3 Hatch A4LD 16-18cty/23-25hwy
88LX 2.3 Hatch A4LD 14-18cty/18-24hwy malfunctioning computer for most it's life.

88GT 5.0 Hatch 5spd 18-20cty/26-28hwy
87GT 5.0 Hatch 5spd 19-21cty/27-29hwy
I never get less than 225 miles on a tank. Usually, it's closer to 260 with a couple gallons left.