marchie
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I drive on a light throttle and have the trip computer on 'Instant Consumption' because it's too easy to let the right foot drop and see the fuel consumption increase dramatically, without a commensurate increase in speed]. The gradients in Scotland are sufficient to be able to put the engine under load, and increase the rpm as the drop to 5th and then 4th occurs, stopping a build up of clag/soot. Having done this on several journies, I know that I can still expect the first 1/4 tank to cover 135 miles, and, if I don't achieve this range, it serves as an early warning that something may be amiss, unless I can explain it by extra load carrying/ stop & start driving etcA lot of the cause is driving too steady al the time, diesels need a good blast occasionally,
You see it regularly people bragging how many miles per gallon they get from their motorhome because the drive at 50mph all the time then next thing they are spending a load of money on the egr valve or dpf,
If you don’t want to drive at 70 now and again then consider driving at 60 in a lower gear to get the oil temp up and the revs up, best done on long up hill hauls
Steve