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Instruction
Answer the question based on the provided table.


Table
Table Title: AC Transit
Table Content:
| Year | Manufacturer | Model | Length (feet) | Quantity | Fleet Series | Fuel Propulsion | Powertrain |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1996 | New Flyer | D60 | 60 (articulated) | 30 | 1901-1930* | Diesel | Detroit Diesel Series 50\nAllison B400R |
| 1998 | NABI | 416 | 40 | 133 | 3001-3067, 3101-3166* | Diesel | Cummins M11E\nAllison B400R |
| 1999 | NABI | 40-LFW | 40 | 44 | 4001-4044 | Diesel |  |
| 2000 | NABI | 40-LFW | 40 | 23 | 7201-7223 | Diesel | Cummins ISM\nAllison B400R |
| 2000 | MCI | D4500 | 45 | 30 | 6001-6030 | Diesel |  |
| 2001 | MCI | D4500 | 45 | 10 | 6031-6040 | Diesel |  |
| 2003 | MCI | D4500 | 45 | 39 | 6041-6079 | Diesel |  |
| 2003 | NABI | 40-LFW | 40 | 46 | 4051-4090 | Diesel | Cummins ISL\nAllison B400R |
| 2003 | Van Hool | A330 | 40 | 110 | 1001-1110 | Diesel | Cummins ISM\nVoith D864.3E |
| 2003 | Van Hool | AG300 | 60 | 57 | 2001-2057 | Diesel | Cummins ISM\nVoith D864.3E |
| 2005 | Van Hool | A300FC | 40 | 3 | FC1-FC3 | Hydrogen |  |
| 2006 | Van Hool | A300K | 30 | 50 | 5001-5050 | Diesel | Cummins ISB\nVoith D864.3E |
| 2007 | Van Hool | AG300 | 60 | 10 | 2101-2110 | Diesel | Cummins ISL\nVoith D864.3E |
| 2007 | Van Hool | AG300 | 60 | 15 | 2151-2165 | Diesel | Cummins ISM\nVoith D864.3E |
| 2008 | Van Hool | A300L | 40 | 27 | 1201-1227 | Diesel | Cummins ISL\nVoith D864.5 |
| 2008 | Van Hool | A300K | 30 | 1 | 5099 | Diesel-electric hybrid |  |
| 2008 | Van Hool | A300K | 30 | 39 | 5101-5139 | Diesel | Cummins ISB\nVoith D854.5 |
| 2010 | Van Hool | AG300 | 60 | 9 | 2191-2199 | Diesel | Cummins ISL\nVoith D864.5 |
| 2010 | Van Hool | A300L FC | 40 | 12 | FC4-FC16 | Hydrogen |  |
| 2013 | Gillig | Low-floor Advantage | 40 | 65 | 1301-1365 | Diesel | Cummins ISL 280 HP \nAllison B400 6-speed |
| 2013 | New Flyer | Xcelsior D60 | 60 | 23 | 2201-2223 | Diesel | Cummins ISL 330 HP\nAllison B400 6-speed |
| 2013 | Gillig | Low-floor Advantage | 40 | 55 | 6101-6155 | Diesel | Cummins ISL 280 HP\nAllison B400 6-speed |


Question
compare different types of fuel and tell which is most used.


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["Diesel"]