
Originally Posted by
d_mac
Hi sir, it doesn't have to really be spot-on accurate. That fuel calculator provides only "indicative" fuel consumption over a distance that you'd be travelling.
Moreover, even if that fuel calculator takes into account the 3-D (or topographic) features of the land (changes in x, y, z where z accounts to any changes in elevation along the distance you'd be travelling) there will still be some few discrepancies between distances reckoned from satellite imaging compared to ground survey. Barometric and temperature changes are also factors to take into account.
That's why, it's always better to top-up a bit more after getting the indicative fuel that you'd most likely be consuming for the route.
Cheers!