Given the choice, such heavy oil refineries usually prefer to buy bitumen rather than synthetic oil because the cost is lower, and in some cases because they prefer to produce more diesel fuel and less gasoline.
ɡˈɪvən ðə tʃˈɔɪs, sˈʌtʃ hˈɛvi ˈɔɪl ɹᵻfˈaɪnɚɹiz jˈuːʒuːəli pɹɪfˈɜː tə bˈaɪ bɪtˈuːmɛn ɹˈæðɚ ðɐn sɪnθˈɛɾɪk ˈɔɪl bɪkˈʌz ðə kˈɔst ɪz lˈoʊɚ, ænd ɪn sˌʌm kˈeɪsᵻz bɪkˈʌz ðeɪ pɹɪfˈɜː tə pɹədˈuːs mˈoːɹ dˈiːzəl fjˈuːəl ænd lˈɛs ɡˈæsəlˌiːn.