WHAT ARE THE FACTORS AFFECTING FUEL CONSUMPTION?

Mga Bossing ano ba ang mga factors na nagiging dahilan ng mataas na fuel consumption?

Yung Timing Belt ba one of the factors ? i recently had a timing belt replacement then parang naobserve namin mas lumakas sya sa gasolina then may nakapag advise sa akin na baka sala daw sa timing kaya malakas is this true??

And ano-ano ba ways to minimize the consumption or maimprove ito.

many thanks mga tsikoters!