
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 van has 40% better fuel efficiency than his old truck, and the fuel for the new van costs 30% more per liter than the fuel for the old truck, determine the percent by which Elmer will save or spend more if he uses his new van instead of his old truck for a trip covering 300 kilometers.

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