Interesting: Valvoline has partnered with the company that makes that electronic "TIWI" device and is offering a
“Fuel Proof Guarantee”: in combination with their lubricants plus the feedback from the device, truck fleets will improve fuel economy by 4%.
4% is nothing to sneeze at when you consider how much money a trucking co spends on fuel.
Quote:
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The Tiwi (pronounced “tee-wee”) system is designed to monitor vehicle speed as compared to the posted highway speed, seat belt usage, hard braking, rapid acceleration and more. When an out-of-range event occurs, a small windshield- or dash-mounted in-cab device provides verbal prompts to the driver, advising him or her to take immediate corrective action. In the case of speeding, drivers generally have a few seconds to respond before a violation notice is also automatically sent back to dispatch; in the case of aggressive driving incidents, the violation notice is also immediate. Fleets can set performance and sensitivity parameters for each tiwi system.
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Source:
Valvoline partners with Tiwi to guarantee miles per gallon boost
I guess when your job is on the line, you've got more incentive than Joe public to make an effort to avoid being overtly wasteful.