This mod adds fuel and fuel meter to almost all vehicles, and also adds fuel station markers on the map. Mobile version also includes unlocked mainland from the start.
Mobile:
Copy main.scm to User Applications\\GTA Vice City\\gta3vc.app(for ios, not sure about android atm) with iFunBox(or another similar software), and start the new game. Old saves won't work because it's main.scm mod.

PC:
Make sure you have exe v1.0(gta3 v1.1 supported too), copy CLEO folder from .zip to GTA 3/VC root directory. Replace RKchat(radar_copcar in gta 3) in hud.txd and start the game.