Srf08 Sonar Higher ranges

Hello, Srf08 work well in 1st range, but for higher ranges the data is very bad. I have read that the range of this type is 3cm to 6 m, with an accuracy of
less than 5cm . Here I attach the data read from srf08 from first range to fourth with real distance of object. Do I get the wrong data or should I do some process on it? Could anyone please help me?
R1 MSB , R1 LAB , ... : DATA READ FROM SRF08 R1 MSB= RANGE 1 MSB R1 LSB= RANGE 1 LSB DISTANCE IN CENTIMETERES
Distance R1 MSB R1 LSB    R2 MSB    R2 LSB    R3 MSB    R3 LSB    R4 MSB    R4 LSB 26         0    27    0    87    0    152    0    216 34         0    36    0    99    0    164    0    230 39         0    37    0    100    0    164    0    232 39         0    37    0    102    0    167    0    233 52         0    41    0    107    0    172    0    242 61         0    40    0    104    0    173    0    238 61         0    40    0    105    0    170    0    234 62         0    41    0    106    0    174    0    239 62         0    47    0    112    0    177    0    241 73        0    41    0    106    0    171    0    235 73         0    55    0    121    0    186    0    252 73        0    37    0    102    0    167    0    233 73        0    46    0    110    0    177    0    241 81        0    39    0    106    0    171    0    236 81        0    40    0    105    0    170    0    236 88        0    43    0    108    0    173    0    241 88        0    59    0    125    0    190    0    255 91        0    39    0    103    0    168    0    236 91        0    38    0    103    0    168    0    232 93        0    40    0    105    0    171    0    237 93        0    41    0    105    0    170    0    235 104        0    51    0    116    0    182    0    247 104        0    44    0    108    0    173    0    243 104        0    58    0    122    0    189    0    254 104        0    58    0    122    0    189    0    255 116        0    38    0    104    0    169    0    235 116        0    47    0    113    0    178    0    242 119        0    52    0    118    0    184    0    249 119        0    55    0    119    0    184    0    251 130    0    56    0    123    0    189    1    6 130    0    43    0    108    0    173    0    244 133    0    38    0    102    0    167    0    233 144    0    68    0    134    0    198    1    12 144    0    62    0    138    0    203    1    12
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