The national average retail diesel price rose 6.1 cents to $4.026 a gallon during the week ended Aug. 20.
There are three versions of heavy-duty natural gas engine technologies available or in development in North America.
The new OnGuard collision safety system integrates collision warnings, active braking and automatic collision mitigation braking.
Industry begins to accept expensive natural gas engines running on cheaper fuel, in spite of power and range tradeoffs.
Bridgestone officials say the company has redoubled its focus on delivering value to "the boss," its commercial customers.
The DT12 will be available in the Freightliner Cascadia Evolution starting in May 2013.
The national average diesel price soared to $3.96 a gallon — 13 cents per gallon higher than the same week last year.
Clean diesel engines will continue to be the dominant power source for heavy-duty vehicles in the United States for decades, says a Department of Energy study.