MotorMouth is a feature-rich app that is designed to simplify the task of finding the cheapest fuel prices in Australia. It is a technological solution aimed at helping drivers cut down on fuel costs and making the task of filling up less strenuous. With a user-friendly interface and a comprehensive network of petrol stations covered, it provides real-time updates on the lowest fuel prices near one's location.

One of the attributed strengths of MotorMouth is its broad coverage. The app encompasses a diverse array of petrol stations across Australia, including both well-recognised chains and small independent stations. Through this extensive network, it ensures the user does not miss out on any potential deals available in the vicinity.

MotorMouth is quite laudable for its real-time updates feature. With the rapidly fluctuating fuel prices, it enables users to stay connected with real-time changes, providing them with the most current information. User reliability on this application is supported by its ability to promptly inform about the lowest fuel prices available nearby.

Equally noteworthy is the app's usability elements. MotorMouth's interface is designed to be user-friendly and intuitive. The information is displayed in a clear, concise manner, making it easy for users to navigate and comprehend. The developers have incorporated tools to customise the display according to user-preferences, further enhancing the user experience.

However, while the app scores high in the parameters of utility and usability, it does come up short on some counts. The primary concern for many users is the sporadic performance of the app. There have been reports of occasional glitches and lags, that interrupt the real-time updates. This inconsistency in performance sometimes restricts the user from making the most of the benefits offered by the app.

Additionally, some users have indicated that the accuracy of the app can be inconsistent. The app relies heavily on user-generated data, which often leads to discrepancies in the listed prices and actual prices at the petrol stations. This does not always result in a successful hunt for the cheapest fuel as promised.

Furthermore, while many find the user-interface intuitive, there are instances where some users find the personalisation options a tad overwhelming. There's a considerable learning curve to understand the different functionalities, particularly for the less tech-savvy users.

In conclusion, MotorMouth comes across as a well-intended app that has assisted many users in their search for the cheapest fuel in Australia. It shines with its capacity to offer real-time updates, broad coverage, and user-friendly interface. However, improvements can be made in terms of app performance and data accuracy to further enhance the user experience. For those willing to navigate the learning curve and bear occasional inconsistencies, MotorMouth can prove to be a valuable tool to economise fuel expenses.