So, $80/1.4 = 57 so that's 57 litres of fuel used per week.
Average combined fuel consumption of a V6 Camry is around 11.5/100km taking into account largely suburban use (75% suburban, 25% highway)
So 57/11.5*100 = 496km a week, or about 25000kms a year.
So, a cost saving of $1,259 a year...