Good morning Dallan,
The only differance between the F and the G series was that the G had the front axle further forward to comply with legislation in Sweden regarding overall lengh (road train) and the spacing between the axles to achieve that.
Advantage was taken with that to add extra fuel etc.
To my knowledge, “limited at my age”, they were all produced in Sweden and exported.
I sold Volvo trucks from 1975 and 1986, Harvey