
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Elmer upgraded from his old car to a new one, which provides 75% better fuel efficiency, measured in kilometers per liter than his old car. Additionally, his new car uses diesel, which costs 30% more per liter than the gasoline used by his old car. Assuming Elmer now travels 50% farther than before, determine the percentage by which Elmer will save or spend more money using his new car for this longer trip.

Present the answer in LaTex format: \boxed{Your answer}
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