In 1991, LEGO released 3 Town Vehicles sets, all of these sets have been retired. For that year, the total price of all retail sets cost $25, today those sets are valued around $263, a growth of 961%.
Most valuable 1991 LEGO Town Vehicles set
6352 Cargomaster Crane $158.14
Most owned 1991 Town Vehicles set
6669 Diesel Daredevil
3 sets

6352 Cargomaster Crane

Theme / Subtheme Town / Vehicles
Year 1991
Pieces / Minifigs 140 / 1
Availability Retired
6352 LEGO Cargomaster Crane
Retail $12.75
Value $158.14
Growth  +1140.3%
Annual growth 7.3%

6510 Mud Runner

Theme / Subtheme Town / Vehicles
Year 1991
Pieces / Minifigs 34 / 1
Availability Retired
6510 LEGO Mud Runner
Retail $3.25
Value $30.37
Growth  +834.5%
Annual growth 4.1%

6669 Diesel Daredevil

Theme / Subtheme Town / Vehicles
Year 1991
Pieces / Minifigs 90 / 1
Availability Retired
6669 LEGO Diesel Daredevil
Retail $8.75
Value $74.06
Growth  +746.4%
Annual growth 5.4%