In Indonesia currently, so thought interesting to report one can fuel with bio-diesel ("Bio Solar") for only Rp 5k/ltr ($1.26/gal USD). It is 10% bio-fuel, or B10. In comparison, gasoline costs Rp 17.5k/ltr ($4.42/gal) at national Pertamina stations. But, above is a government-subsidized price and there is also subsidized gasoline (lower octane) for slightly more at Rp 7k/ltr.
Yes, diesel is termed "solar", so be careful what you fuel with. A co-worker long ago mistakenly fueled a gas rental car with diesel fuel in Spain, being confused by the terms. Gasoline is termed "bensin" in Indonesia, as in Holland and Germany, compared to "petrol" in British lands. "Gasoline" is only used in the Americas, from an 1880's brand name.
https://money.kompas.com/read/2022/04/22/204210426/update-harga-bbm-pertamina-shell-dan-vivo-jelang-mudik-lebaran-2022