Your vehicle may run OK on lower octane fuel and as long as there is no knocking it should not hurt the engine. However, power output and efficiency in one way or another is lower with the lower octane. The refining process is the key factor in achieving octane rating, detergent additives and octane booster are added to meet rating listed on the pump. One of the advantages of Sunoco 94 is better refining which reduces need for octane booster and a premium detergent additive to keep injectors and intake valves cleaner. No matter what octane you use, fuel injector cleaner added every 5,000 miles will keep the injectors clean and operating efficiently.
FYI: Most fuel stations have two tanks (high & low) and what comes out of the pump is a blend. Ethanol blended fuels have a reduced energy content, your bang for your buck is less. Ethanol may be green but it's a green gimmick.