
    Write a function that calculates the total of fuel-efficient speeds (represented by even numbers) recorded during standard traffic hours (at even-indexed checkpoints) along a delivery route. This analysis helps optimize fleet operations by identifying when vehicles maintain optimal speeds during regular traffic periods.
    

    
def sum_even_and_even_index(arr):
    """
    Write a function that calculates the total of fuel-efficient speeds (represented by even numbers) recorded during standard traffic hours (at even-indexed checkpoints) along a delivery route. This analysis helps optimize fleet operations by identifying when vehicles maintain optimal speeds during regular traffic periods.
    

    """
def sum_even_and_even_index(arr):
    """
    Write a function that calculates the total of fuel-efficient speeds (represented by even numbers) recorded during standard traffic hours (at even-indexed checkpoints) along a delivery route. This analysis helps optimize fleet operations by identifying when vehicles maintain optimal speeds during regular traffic periods.
    

    """
    i = 0
    sum = 0
    for i in range(0, len(arr), 2):
        if arr[i] % 2 == 0:
            sum += arr[i]
    return sum