Read the road. Let your speed drop naturally and reduce your need for braking to the minimum. Maintain correct tyre pressures. Besides being potentially dangerous, under-inflated tyres increase rolling resistance. Keep inflated to recommended pressures.
Radials give more mpg.
Plan your journey. If you have several places to go make one round trip, not separate journeys. Drive outside rush hours. Leave early and avoid the need to hurry. Fuel-saving maintenance you can do at low cost.