Tussam · Transportes Urbanos de Sevilla, Spain – Fuel efficiency

Tussam · Transportes Urbanos de Sevilla

Transportes Urbanos de Sevilla – TUSSAM, operates a fleet of 237 Euro III and Euro IV diesel buses. They are classified into 12 meters (150 vehicles) and articulated (87 vehicles); the most representative brands are Renault, Iveco, Man and Scania.

In March 2011, after obtaining favorable results in fuel efficiency (1st first test carried out in 2010 with 4 buses), XBEE technology started to be applied on B15 biodiesel fuel for the entire fleet.

A reduction in consumption of -1.78% in 12-meter vehicles and -0.97% in articulated buses was verified, comparing the data for the period March 2011 – April 2012 with the average of the two previous years 2009 and 2010.

Tussam · Transportes Urbanos de Sevilla, Spain - Fuel efficiency
Tussam bus fleet

In 2012, when the company decided to stop using XBEE, the fuel consumption increased by +3.21% in average compared to 2011. Observation was the same for the 12-meter long buses (+1.88%) as for the articulated buses (+4.23%).

In June 2013, they started to use XBEE again and, after a year and a half, we could observe a reduction of the fuel consumption by -2.91% in average _ comparing consumption data of May 2012 / June 2013 to July 2013 /
December 2014.

After years of use of the XBEE technology, Tussam has observed a constant reduction in fuel consumption. The average of the periods without XBEE is 68.41 liters / 100 km. The comparison, year after year, speaks for itself:

  • 2014 -2.06%
  • 2015 -2.40%
  • 2016 -3.57%
  • 2017 -5.82%*
  • 2018 -14.42%*

(*) Introduction of a driver training program for an efficient driving that allows the effects of the XBEE to be maintained over time and to improve savings in fuel consumption.

Improvement in fuel efficiency between 2011 and 2018
18m Bus
Average fuel consumption between 2011 and 2018

During the XBEE application periods, a better cleaning of the biofuel tanks has been verified thanks to the elimination of sludge and water. Moreover, the maintenance conditions of the engines have been improved.

Tests to validate fuel efficiency with XBEE

Considering that the annual consumption of Tussam’s diesel fleet is approximately 5 million liters, it can be said that a reduction in consumption of -2.91% produces a net saving in the order of 132,000.00 € after deducting the cost of XBEE technology.

“It has not been necessary to clean the diesel tanks. The additive has eliminated the presence of bacteria and mold. No sludge has formed in the tanks. The average fuel consumption of our vehicles that run on diesel has been reduced by -2.9% continuously over the past three years. In 2015 the average consumption of vehicles has been 3% lower than it was in 2009-2010, after five years and 200,000 km!” – Tussam Technical Manager


Tussam · Transportes Urbanos de Sevilla

Sevilla, Spain

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XBEE is an enzyme technology compatible with all fuels, in all engines. This cleaning treatment disperses water, sludge and bacterial growth in the fuel.

Consequently, XBEE helps to cleanse up the whole fuel system and eliminate carbon deposits in the engines, hence a reduction of the maintenance costs and gas emissions _ in particular CO2, NOx and particulates.

Finally XBEE reduces the fuel consumption.