Spitfire/Hurricane etc and drop tanks
It’s well known that until the P51 bombers going to Germany from England didn’t have an escort with the range to accompany them for the entire mission
The Mustang had a large fuel capacity even without drop tanks but until it came along why didn’t the allies fit them on other types such as the Spitfire, Hurricane, P47 and others ?
They couldn’t have gone as far but they could have stayed with the bombers a lot longer ?