Here is a gas powered portable generator with Bluetooth that lets you monitor fuel level, power consumption, and other info on your smartphone. It has a 420cc engine and 4 outlets for your everyday electronics. It comes with 7.5 gallon metal fuel tank that lets you use the generator for up to 9 hours at 50% load.
The companion app is available for iOS and Android devices. It not only shows total hours on generator, it also provides maintenance reminders.