Error of Redundancy

Often tested on GMAT Sentence Correction is the error of redundancy i.e. saying the same thing twice in a sentence.

Consider the following examples:

1. I have driven a car previously in the past.
2. My marks have increased up
3. I got a free gift yesterday

As you might have noticed each of these options is saying the same thing twice:

1. 'Previously' is the same as 'in the past'
2. Is it possible for something to 'increase down'?
3. If it's not free it's not a gift!

So, not only do these sentences sound awkward, but they also break the rule of 'brevity' by repeating the same thing twice.

On some sentences it's easy to spot redundancies but some can actually make you think, specially when you are not aware of what error you are looking for.

Consider this one for example:

The per capita consumption of diesel has gone up from 500 liters to 1000 liters per person every year.

Can you spot the redundancy in the above sentence?