This is the 4632nd most frequent Russian word.
дизтоплива
Diesel fuel.
Here, 'дизтоплива' is used to indicate the type of fuel needed for the truck.
Для грузовика требуется много дизтоплива.
The truck requires a lot of diesel fuel.
In this sentence, 'дизтоплива' refers to the product sold at gas stations whose price has risen.
цен стал дизтоплива на автозаправках.
The price of diesel fuel has increased at gas stations.
Here, 'дизтоплива' is used in plural form to talk about the reserves of diesel fuel available.