I seam to periodically re-address this issue but never really come up with a satisfactory answer. The hoses in question that I have issues with are the short lengths between tank, pumps, filters and fuel rails. They are usually secured with clamps and often have tight bends so this generally rules out Teflon pipes. I hate braided hose as you have no way off checking the condition of the hose until it spray fuel everywhere with the engine running. I find that on my cars the standard SAE J30R9 hose last about 2 years before showing signs of slight cracking and hardening. At this point I replace the hose. Some of the rubber fuel hoses on my blue car are from the old soarer so date back to '92 and show absolutely no sign of degrade are still very flexible so it is possible to get "better" rubber hose. So what is the answer? nitrile rubber maybe?