Your carb or emissions or exhaust is foobarred in some way. I'm assuming you have the
stock nikki carb and intake, full emissions and rats nest setup.
Normally you should be seeing well above 20 mpg highway, usually in the 25 mpg range if
everything is up to snuff.
I have a Dellorto 48 DHLA and no emissions or stock exhaust and I get 24-25 mpg normally. This is cruising on the highway. It drops to around 17-18 city and 10-12 in the
mountains
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1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs
Project Fat Nikki Budget 12A rebuild Video setup < $30.00