Gibraltar to Lanzarote in September

[Oberon]

Hi, can someone offer me some advice? I am taking a Rodman 12.50 from Scotland to La Gomera and wanted some information in regard to the leg between Gibraltar and Lanzarote! I will need to take on fuel in Adigar and wondered if anyone can help with information on the cost per litre? And also is it easily accessible.

I am also looking to do the trip in late September! Any advice would be appreciated