True, but it does depend on the tubing diameter, and actual flow rate.
Using 1/2" tubing, you can achieve minimal flow restriction where one looses:
0.09" of head, per foot of tubing @ 0.5 gpm
0.34" of head, per foot of tubing @ 1.0 gpm
0.72" of head, per foot of tubing @ 1.5 gpm
1.23" of head, per foot of tubing @ 2.0 gpm
(Calculated using Hazen-Williams formulae, Darcy's would be more accurate)
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