Having that amount of expense, I'd think you would be ahead to purchase a shop, buy fuel in bulk and save a lot of money.
Plus, you are building equity, and not giving money to your landlord.
Or, if you're stuck where you are, offer to pay for insurance and related costs for the onsite tank. It would still be cheaper with that volume.
'07 Dodge C/C; quadcab flatbed; Western 8.5 Pro;
'04 Dodge quadcab; Western 8.5 Pro Plus; Western wings; Boss TGS 1100; Ebling if I hit the lottery!
'06 Cub Cadet M48 Tank; '11 Cub Cadet M48 Tank; '10 Cub Cadet H1748 walkbehind; Stihl handhelds
'10 Timberwolf TW-5; '08 Kawasaki Teryx; for the firewood...conveyor in the works