I have the old 1996 Honda 250 bike to ride to work and take care of local trips. It get 60 miles per gallon, cruises at 60 mph if there is no wind.
No cargo, no highway speeds, no weather protection...
( 18 degrees was too cold to ride to work, but it was only 8 miles ) but 60 mpg helps cut the fuel bill, some.
The S-10 ZR2 ( -16 city/ -19 hwy ) does a lot worse on gas than the Z71 Sierra 5.3 ( 18.5 city / 22 hwy -flat/ no wind)
The 86 Mustang was a 2.3 (88 hp) that is slowly being rebuilt with a 5.0 and 650 holley-- not a project I would ever do again
, but I started it when gas was under $2 and before the Camaro was confirmed.