(30 Jun 2015, 11:08 pm)busmanT wrote Haven't spotted this already answered - Trident does just less than 6 mpg, B7/President just over 6 mpg, B9 around 7 mpg, hybrid B5 do almost 9 mpg (but cost 50% more to buy).
Many, many years ago, Jaguar ran 2.4 litre and 3.4 litre cars in convoy and the 3.4 litre one returned better fuel economy, so it can be that a larger engine with higher gearing can use less fuel that a smaller engine one with lower gearing.