| Is 23.3 miles/gallon OK for my Accord ?
city / highway ? # of cc ?
Mpg is difficult to compare, e.g. [i] the more times engine
must heat up ( open loop, high idle rpm when cold ) during
a measurement period, the lower is mpg. [ii] if tyres have
nitrogen, or tyre walls are softer, or toe-in is zero, then
rolling resistance is lower, more mpg [iii] if oil used is
cheap & coarse, then more friction & lower mpg esp on
highway. [iii] 1 driver may accelerate hard & never coast,
another driver accelerates slowly & always coasts. [iv] 1
driver must drive in rush hours, another can avoid rush hours.