It seems like there's a reliance on a graph or image that has not been provided here. To evaluate which statement is true about Stephon's car and Devon's car based on gas mileage, you would need to compare the values shown in the graph for Devon's car to Stephon's gas mileage of 28 miles per gallon.
Assuming you could describe the graph or share the specific values shown for Devon's car, I could help you determine which statements might be accurate based on the information given. If you can provide details about the gas mileage for Devon's car from the graph, I can assist you further!