Questions

Can I add more gas stations? Yes, in the stations.lua file you can add or remove as many gas stations as you need. I don't see the supercharger stations Check that you have the supercharger prop added and that it starts before the script.

Can I add more electric vehicles? Yes, in line 105 of config.lua you can see a default list, but you can add as many vehicles as you need.

electricModels = { -- UPPERCASE
    ["AIRTUG"] = true,
    ["NEON"] = true,
    ["RAIDEN"] = true,
    ["CADDY"] = true,
    ["CADDY2"] = true,
    ["CADDY3"] = true,
    ["CYCLONE"] = true,
    ["DILETTANTE"] = true,
    ["DILETTANTE2"] = true,
    ["SURGE"] = true,
    ["TEZERACT"] = true,
    ["IMORGON"] = true,
    ["KHAMELION"] = true,
    ["VOLTIC"] = true,
    ["IWAGEN"] = true,
}