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I tested my 600mm long boattail with aba test @130 km/h speed
Here are my todays boattail test results:
on N 4.7l S 4.0l
on N 4.6l no data
off N 4.9l S4.3l
off no data S4.3l
off N 4.8l S4.2l
on N 4.7l S4.1l
on N 4.7 l S4.1l
avg on N = 4,675l avg S 4,066l
avg off N= 4,85l avg S 4,266l
diff N = 3,6% diff S= 4,7%
Total difference 4,15% less fuel in this test. My test route was not perfect due to hilly motorway, but the difference is clear. Also my cars fuel gauge shows only 0.1 liter accuracy which was also little problem. That is the reason for so high speed in the test. Also during driving the differences came in the uphill sections. Without the spoiler fuel consumtion rise much more...
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