Welcome to the forum!
The hardest part of 'playing the game' for you is that you have a carb, so fitting a digital fuel consumption meter isn't really feasible (unless the folks in the MPGuino subforum have sorted out this problem.) Instant / trip average feedback is a critical piece of the puzzle, and going tank by tank is too slow for meaningful feedback to help you fine tune your techniques.
"Bumps and holes everywhere" ... so, you're not doing the typical Manila stop&go city commute, correct? Can you describe your typical drive? Rural? Urban? Average speeds? Hilly/flat?
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