Don't worry about it, honestly. 55 Gallon drums you'll burn through like its going out of style. You'd be lucky to get 1000 miles out one drum in the city. Stick with making power the old fashioned way and enjoy yourself.
Maintenance isn't bad IMO since I do all the labor myself. Any up charges are entirely my fault. Let me list what I go through right quick.
Bi-Annual snapshot, timing belt
My biggest reoccuring annual expense is tire wear. My Hankook RS-3's used to get about 14k miles per set (200hp ago), but I'm moving back to the midwest so I will have dedicated winter set of rims (17" Volks) and a dedicated summer-powwwwahahhhh rims (18" Enkei). You could of course go with much less ridiculous tires that have some moderation in wear, and save big.
Fluids for the drivetrain can all be sourced from Amazon (Redline Fluids here) and I try to change out every 6 months, spring and fall at $50-80 a go.
I actually have a very large google spreadsheet that breaks down every cost I've had minus fuel / routine oil since I purchased the car if you're interested in seeing the madness.