What is Fuel Consumption Rate and Decibel Rating for Onan 5,000-Watt Dual Fuel Portable Generator

Published 06/11/2026

Question:

How many gallons of gas does it hold How long does it run on tank of gas. How long on propane What’s the decemil level of quietness. Like 58 0r 62 Can I buy extended warr. Can it run two ac units on airstream trailer

asked by: JD

Expert Reply:

Hey JD, the A075C500 Cummins Onan generator part # CM58MR that you referenced has a 3.4 gallon fuel tank. On gas along it can run for 16.8 hours at 25 percent load or 13 hours at 50 percent. When running a propane tank it can run for 20 hours.

The decibel rating is 52 dB at 23 feet away which is really quiet. The warranty is 3-Year residential warranty / 1-Year commercial warranty. You can also buy an extended warranty as well.

It will also have no problem with two RV AC units as well.

Do you have a generator currently?

expert reply by: Jameson C