How can jet engines be more fuel efficient?

Jet engines are becoming more fuel efficient but how? How can basicaly simple engine( by how it produces thrust) be altered to allow for greater range and power? Both turbofan with reheat and without.

windows 7 vpn

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).