I used to get 280 miles out of a full tank on my RX8 192. The six-port engines are thirstier, but I had to slow down a bit to eke it out to 300 miles.
However, a 4-port, in a lower state of tune, especially if it's not fuelling the way production EU cars are set up (apparently the Euro IV compliant models run rich to prolong the life of the cat; didn't work, mine failed at 17K) could probably comfortably do 300 miles on a tankful.
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I used to get 280 miles out of a full tank on my RX8 192. The six-port engines are thirstier, but I had to slow down a bit to eke it out to 300 miles.
However, a 4-port, in a lower state of tune, especially if it's not fuelling the way production EU cars are set up (apparently the Euro IV compliant models run rich to prolong the life of the cat; didn't work, mine failed at 17K) could probably comfortably do 300 miles on a tankful.