Task 2. There are a total of 15 stations: 4 new ones and 11 old ones.

The throughput capacity of the old stations is 11 x $200=2200$ vehicles per day, and for the new ones: $200+700=900$ vehicles per day. In total, the stations can refuel: $2200+900=3100$ vehicles per day.

Vehicles from the city fleet account for only $70 \%$ of all vehicles refueled at the CNG stations in St. Petersburg, so $3100 x 0.7=2170$ vehicles can be refueled. Currently, there are 1000 vehicles in the city fleet, so the city fleet of gas-powered vehicles can be increased by 1170 units.
Task 2. By how many units can the city's fleet of natural gas vehicles be increased in 2022, assuming that the capacity of each of the old CNG stations in the city is equal to the capacity of the new station on Narodnaya Street, and that the city's fleet constitutes only $70 \%$ of all vehicles refueling at CNG stations in St. Petersburg. Assume that the stations are used at $100 \%$ of their capacity.