Distinct improvement in fuel efficiency
The change to Pulstar® plugs gapped to factory 0.035″ was the only change made for this test. We waited for the first tank of fuel to burn through before making comparisons. At that point there were several distinct improvements: Better tip-in throttle response at any road speed and under heavy acceleration. Less throttle needed to sustain normal “cruise” road speeds. Less downshifting on grades with cruise control applied. Acceleration improved with both forced and cruise control downshifts. Distinct improvement in fuel efficiency; approximately one mile per gallon improvement (5.5%) under “city” and “highway” or interstate test conditions; this engine has always started well. Click here to watch the video.