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Hi, my diesel (89klms) sat a lot during the pandemic. Since then it has only done local milage and fuel economy is about 30% down and seems to drop very fast. I have done oil & fuel filters, air cabin filters / cleaned the EGR valve (not lower split pipe yet) and added a fuel injector cleaner with no improvement. The fuel gauge seems to jump occassionally, (high and low) which makes me think tank might be dirty; woukd this cause poor fuel economy? Also a Question; do these diesels have a throttle body to clean (a friend mentioned it). I have no engine codes and have recently been on a few good runs and I think the DPF has worked, but no improvement in fuel consumption. Any ideas of the next steps i should take please. Not a mechanic, merely an interested student of diesel cars, thank you in advance, Neil
 
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