int gas_referno[10][2] = {
{1,700},
{2,700},
{3,650},
{4,700},
{5,680},
{6,580},
{7,550},
{8,680},
{9,580},
{10,599}
Will the first value in each pair always be equal to row number + 1? If so, a simple 1D array would suffice:
int gas_referno[10] = {
{700},
{700},
{650},
{700},
{680},
{580},
{550},
{680},
{580},
{599}
To get the gas amount for vehicle #3, gas_referno[2] contains the value. To get the value for vehicle #3, gas_referno[n-1] contains the value.