whats a trip computer ?
your car has too many fancy electrics – maybe they work harder and use more fuel when you get up to speed.
old school diesel thumper technology has its uses. reliably predictable fuel consumption being one- wether im doign 30 through town or 81 down the french toll roads based on a brim to brim vs milage calculation i get between 40-45 mpg – a margin of error im happy to take as being the difference between different fuel pumps because its not always the slower speeds that yeild the highest return.
the other thing people who moan about fuel prices neglect to take into account is servicing cars…. a good service , new oil ‘& filters can make your car more economic.