Reducing your fuel bill will no doubt help your bank balance. The shortest route is not always the best as it can be congested, making your car burn more fuel. Sometimes a slightly longer but less congested route is the better option. If you find yourself driving in the same route again and again for different purposes, it may make sense to combine some of them to save your time and fuel.
Your air conditioning also increases fuel consumption. Don’t run it if you don’t need it and use your windows.
Check your tyre pressures at least once a month, even if you only use your car occasionally. If your tyres are not at the correct pressure, the rolling resistance and tyre wear will increase, and the fuel efficiency will decrease. On the other hand, overinflating tyres will result in bumpy rides and increase the risk of failure.