That's not too bad, thought you'd have to go smaller with the rear cage.
In my old 20v (depending on how I drove it), I used to see about 290-310 miles to a tank. I also had an effective volume of about 45 litres.
If you take a couple litres out for real world situations, you should see a range of about 280 miles.
No rear cage! It’s going to be a fully functional road car.
I used to get 350/400 miles on my old one with a 20v and that’s with the standard mk2 tank which is a bit bigger so, I don’t mind losing out a little but I don’t want to be filling up every 5 minutes! But this will be much quicker and heavier so it’ll use more for sure.
Planning a 45l eBay jobby, there’s plenty of space behind the diff and Under the floor. Or I’ll get something a bit bigger made up, depends how I feel when the time comes really