On what basis have you calculated getting 17l/100? To accurately measure usage you have to fill the vehicle and then measure how many kms travelled until you fill again.
Driving for 6-8 hours in 2nd gear towing a trailer is not a reasonable measure of h/way economy, nor is driving 300kms and using the guage being a bit over half.
If you are serious about calculating your true economy, buy a Scanguage, not a GPS..just a suggestion.




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