I'd need to know exactly what your mileage is before I could provide exact help.
However, best way to check injectors in the short term is to tip a bottle of injection cleaner into your tank next time you fill up. This generally works, unclogging anything that is amiss. (if you haven't played with your injectors they should be fine).
Actual pressure testing involves expensive equipment and any problems "should" have been picked up during tune up.
Having said that, if your fuel consumption is really so high that you are noticing it, I'd be looking for a leak.
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