I hate to break up some common misconceptions here...!

Tinting a primer isn't needed for 75% of the colors out there!

Most people tend to fall into the trap of thinking..."Well, if I tint my primer, it'll save me a topcoat"!
OR..."I can push my paint farther, because my primer matches the topcoat"!

Uhhhh...No.

If you perceive the need to tint primer under a Beige (or ANY medium color), you may be painting TOO THIN.
Light & medium tint-bases are opaque enough if not pushed too thinly. If you're applying paint at proper rates, there's no reason in the world to tint a primer.

Under some Deep, Vivid, & Neutral-base colors...YES, tinted primer will help. As Jessicaml states, regular 123 has a 2oz./gal. tint-limit. There are deep-tint primers available if you need to do a percentage of an actual color.

>>> If you're not pushing a properly loaded roller past 2'x3' (3'x3' MAX), you're getting paint on properly, and won't need tinted primer.

Faron