
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
Given that Elmer's new car gives $50\%$ percent better fuel efficiency than his old car, but uses diesel fuel that is $20\%$ more expensive per liter than the gasoline his old car used, calculate by what percent Elmer will save money if he uses his new car instead of his old car for a long trip.

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