Sales from other oils and related products were $1.6 billion and $1.2 billion for the nine months ended September 30, 2021 and 2020, respectively, an increase of $0.4 billion, or 34%, due to an increase in prices partially offset by a decline in volume sold. Our product margin from other oils and related products was $54.6 million and $59.4 million for the nine months ended September 30, 2021 and 2020, respectively, a decrease of $4.8 million, or 8%, primarily due to less favorable market conditions in distillates. During the second quarter of 2020, there was a significant recovery in the supply/demand imbalance that occurred at the end of the first quarter of 2020 caused by the COVID-19 pandemic related demand destruction and geopolitical events. The forward product pricing curve flattened during the second quarter of 2020 which positively impacted our product margins.
Results for Gasoline Distribution and Station Operations Segment
Gasoline Distribution. Sales from gasoline distribution were $1.2 billion and $0.7 billion for the three months ended September 30, 2021 and 2020, respectively, increasing $455.1 million, or 65%, due to increases in prices and volume sold. Our product margin from gasoline distribution was $112.4 million and $101.4 million for the three months ended September 30, 2021 and 2020, respectively, an increase of $11.0 million, or 11%, primarily due to an increase in volume sold.
Sales from gasoline distribution were $2.9 billion and $1.9 billion for the nine months ended September 30, 2021 and 2020, respectively, an increase of $1.0 billion, or 53%, due to increases in prices and volume sold. Our product margin from gasoline distribution was $294.0 million and $305.4 million for the nine months ended September 30, 2021 and 2020, respectively, a decrease of $11.4 million, or 4%, primarily due to lower fuel margins (cents per gallon) partially offset by an increase in volume sold. Wholesale gasoline prices rose during most of the first nine months of 2021. Rising wholesale gasoline prices typically compress our gasoline product margin, the extent of which depends on the magnitude and duration of that rise. In contrast, for the first nine months of 2020, our product margin benefitted from higher fuel margins (cents per gallon). Wholesale gasoline prices declined, primarily in March of 2020, due to the COVID-19 pandemic and geopolitical events. Declining wholesale gasoline prices can improve our gasoline product margin, the extent of which depends on the magnitude and duration of the decline.
Station Operations. Our station operations, which include (i) convenience stores sales at our directly operated stores, (ii) rental income from gasoline stations leased to dealers or from commissioned agents and from cobranding arrangements and (iii) sale of sundries, such as car wash sales and lottery and ATM commissions, collectively generated revenues of $134.1 million and $122.8 million for the three months ended September 30, 2021 and 2020, respectively, an increase of $11.3 million, or 9%. Our product margin from station operations was $65.3 million and $57.5 million for the three months ended September 30, 2021 and 2020, respectively, an increase of $7.8 million, or 14%. The increases in sales and product margin are primarily due to increases in activity at our convenience stores.
Sales from our station operations were $357.4 million and $325.6 million for the nine months ended September 30, 2021 and 2020, respectively, an increase of $31.8 million, or 10%. Our product margin from station operations was $176.6 million and $154.9 million for the nine months ended September 30, 2021 and 2020, respectively, an increase of $21.7 million, or 14%. The increases in sales and product margin are primarily due to increases in activity at our convenience stores, including the sales of sundries.
Results for Commercial Segment
Our commercial sales were $202.5 million and $83.5 million for the three months ended September 30, 2021 and 2020, respectively, an increase of $119.0 million or 143%, due to increases in prices and volume sold. Our commercial product margin was $3.9 million and $1.5 million for the three months ended September 30, 2021 and 2020, respectively, an increase of $2.4 million, primarily due to an increase in volume sold and improved margins.
Our commercial sales were $483.4 million and $292.3 million for the nine months ended September 30, 2021 and 2020, respectively, an increase of $191.1 million or 65%, due to increases in prices and volume sold. Our commercial product margin was $10.8 million and $9.4 million for the nine months ended September 30, 2021 and 2020, respectively, an increase of $1.4 million.