Question

define of fuel efficiency
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Answer 1

Fuel efficiency is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work.

Answer 2

$The\, National \,Defence\\ \\The\, National \,Defence\\ Academy \,(NDA) is\, the \,\\joint\, defence \,service \\training\, institute\, of \,the\\ Indian\, Armed\, Forces\\, where\, cadets\, of \,the \,three \,services \\i.e.\, the\, Indian \,Army,\\ the\, Indian\, Navy\, and\\ the\, Indian \,Air\, Force\\ train \,together\, before\, they\\ go \,on \, \\ \\ \captain \rogers$