C152 ON A CROSS-COUNTRY FLT EXPERIENCES FUEL EXHAUSTION AND A SUBSEQUENT OFF-FIELD LANDING.

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ON THURSDAY; 4 PVT PLTS PLANNED TO FLY IN 2 CESSNA 152'S. WX AND ANY PERTINENT INFO WERE OBTAINED THAT MORNING; AND A FLT PLAN WAS FILED AS A FLT OF 2. BOTH ACFT; BEING TOPPED OFF WITH FUEL; DEPARTED ZZZ1 WITH THE INTENTION OF STOPPING AT ZZZ AS THEIR FIRST STOP FOR FUEL. THE ACFT FLEW AS A FLT OF TWO; AND I WAS PIC OF THE FIRST ACFT. VISUAL CONTACT WAS MAINTAINED THROUGHOUT THE ENTIRE FLT UNTIL THE APCH INTO ZZZ BEGAN. AT THAT POINT; BOTH PLTS OF ACFT #1 WERE UNABLE TO MAKE VISUAL OR RADIO CONTACT WITH ACFT #2. ACFT #1 OVERFLEW THE UNCTLED FIELD ZZZ AND ENTERED THE PATTERN TO LAND. UPON LNDG; THE PLTS OF ACFT #1 WERE ABLE TO CONTACT THE PLTS OF ACFT #2 VIA A LANDLINE. ACFT #2 MADE A SUCCESSFUL AND SAFE EMER LNDG IN A GRASS FIELD. THE EMER LNDG WAS PERFORMED DUE TO FUEL STARVATION. NO PERSONS OR PROPERTY WERE HARMED DURING THE LNDG. EACH ACFT IS EQUIPPED WITH 24.5 GALLONS OF USABLE FUEL. ACCORDING TO THE POH; THE ACFT REQUIRES .8 GALLONS OF FUEL FOR ENG START; TAXI; AND TKOF. ONCE THE ACFT ENGS WERE STARTED; THERE WERE NO DELAYS DURING TAXI OR DEP. THAT DAY THE OUTSIDE AIR TEMP WAS APPROX 40 DEGS C AND WOULD HAVE REQUIRED 1.4 GALLONS TO CLB TO 6000 FT OR 1.7 GALLONS TO CLB TO 7000 FT. WITH A CRUISE PWR SETTING OF 2400 RPM'S AT AN ALT OF 6000 FT; THE ACFT BURNS 5.8 GPH -- AT 8000 FT THE ACFT BURNS 5.5 GPH. A SMALL AMOUNT OF FUEL WAS BROUGHT TO ACFT #2. ACFT #2 WAS INSPECTED BY AN A&P ON THE FIELD AND THE MAINT BOOK WAS ENDORSED TO PROVE THE ACFT AIRWORTHY. THE FSDO; LCL AND STATE LAW ENFORCEMENT; AS WELL AS THE LAND OWNERS APPROVED THE DEP OF THE ACFT FROM THE FIELD TO THE NEAREST ARPT; ZZZ. A SUCCESSFUL AND SAFE DEP FROM THE FIELD WAS CONDUCTED.