Hi Cheryl.....welcome to the Club
These are the economy figures below and yours is definitely running low on mpg figures.
I would recommend servicing the engine to ensure that everything is running efficiently....engine oil and filter, speak plugs, check leads/coils, fuel and air filter.
If these components have been replaced recently or you can replace them shortly then this may bring the mpg back to where it should be.
Also, check you tire pressures are correct as this will drag the economy down
2007 Lexus RX 400h 4WD
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Hybrid Vehicle 6 cyl, 3.3 L, Automatic (variable gear ratios) Compare
Fuel Economy
EPA MPG
Premium Gasoline 26 combined city/highway MPG 27 city 25 highway 3.8 gals/100 miles