In three out of four cases, the uncovered trips around
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the circuit used more fuel. The highest difference was at top speed, but surprisingly the figure dropped to less than 0.5% at 80km/h. We expected 64km/h to be closer but at 48km/h there was no real difference.
The test was done at average speed around a controlled traffic-free circular route so weather conditions were consistent throughout. There are flaws to the test because it hardly mirrors everyday tipper activity, but it does give an idea of the difference on particular roads. If you travel a 90km round trip every day and 15% is on motorway, 25% on duel carriage way, 55% on single carriageway and 5% on quarry sites, this chart could well be an indicator as to where you are losing the most money out an the road.
At some point during the day when your tipper leaves the quarry or building site uncovered it will be casting you money.