While my v-6 uses regular, based on various trusted sources, i use the mid grade for small engines - chain saws, lawn tractors, lawn mowers, out board motors, wood splitter, weed wacker, leaf blower.
In my town, my go to station is Mobil, a top tier gasoline that has the detergent additives necessary for contemporary engines. Currently, these are Mobil prices at the station- $3.19 regular, $4.04 mid, $4.44 premium. So 20 gallons of mid grade gas would cost $80.80. However, if i blend 10 gallons of regular ($31.90) with 10 gallons of premium ($44.40) the cost would be $76.30, or a savings of $4.50.