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93 Mazda B2600 large fuel consumption

Hi, I am a new 4WD owner I’ve only ever had a VY and VZ sedan Holden commodore. My partner and I bought a ‘93 Mazda B2600 I think it may have heavy off-road tyres on it. I have heard that heavy/large tyres can increase the fuel consumption but could this be a bigger issue than just changing the tyres, what else could it be?