This is an endless loop and really has nothing to do with the OP original question. It time to move on.
The OP question was is "no Left hand turns a useful fuel saving tactic"? let's stick to that.
UPS says Yes.
Quote:
As a result, UPS:
Saved 10 million gallons of gas
Reduced CO2 emissions by 100,000 metric tons, equivalent to 5,300 passenger cars off the road for an entire year.
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