Thursday, Sep 11, 2014 at 13:37
Yes, very high, but not uncommon figure looking at threads around.
Be sure though not saying 350ks done at fill, 70lt tank, = 20lt / 100km.
Apologies if your hubby already does this, but you should record km / lt at fill (eg. say 360, fuel put in to fill 63, divide 63 x 3.6 = 17.5lt / 100km.
Do this over at least 3 or 4 tanks and on, and you get very accurate fuel averages used.
Finer filter would likely restrict air intake.
Probably the first thing most people do to improve performance and fuel econ, is 1. Get more air into the system (and cooler if possible), adding a
snorkel for example, and 2. Get exhaust gasses out faster, typically by upgrading exhaust to larger dia, or better flow mufflers.
Those aren't cheap mods, so might be better to trade / sell, cut loses and look for a nice little diesel CR dual cab.
This would be about the only way to ensure you get closer to 10 - 12lt per 100.
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