burning alot of gas on 1992 Nissan Pickup (D21)

wonder how to fix the problems
It burns sooo much gas.

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2 answers
Diagnosis is the first place to start. There can be several reasons but without performing some tests, it's impossible to determine what is wrong.
A few things to check:
*fuel pressure
*oxygen sensor operation
*fuel mixture settings (if applicable)
im having the same problem