You are a test manager in charge of system testing on a project to update a cruise-control module for a new model of a car. The goal of the cruise-control software update is to make the car more fuel efficient. Halfway through test execution, you find that the test results do not conclusively determine whether fuel efficiency has improved. Identify all of the following actions that you might direct the test analysts to take to help to resolve this problem.
A. Redesign the fuel efficiency tests B. Revise the quality risk analysis C. Modify the test environment to gather more detailed actual results D. Check for consistency in tested fuel mixtures E. Report fuel efficiency as apparently unchanged