Give two characteristics features of an ideal fuel.

Explanation

To answer the question about the two characteristic features of an ideal fuel, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Definition of Ideal Fuel**:
An ideal fuel is a substance that burns efficiently and produces a high amount of energy with minimal environmental impact.

2. **Characteristic Feature 1: High Calorific Value**:
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