First of all, no.
Most tablets don't come anywhere near being able to display 100% of the RGB gamut. The iPad 3 and 4 were exceptional because they could. It's one of the things besides the high res display that made them look so nice.
Secondly, if they did, then why? Battery life? The 8.9 inch Kindle Fire HDX, which has a screen roughly the same quality as the iPad 3/4 while sporting a higher resolution screen, is on par with the Mini in regards to battery life. Same with the Nexus 7. It's a little overblue, and the screen isn't quite as high resolution, but it's toe to toe with the Mini on lasting power.
Apple didn't intentionally gimp the gamut on the Mini for better performance. That's complete BS. The most likely scenario is that they used lower quality screens as a cost cutting measure.
You and rGiskard are reasoning backwards. You wish to continue believing that Apple tried to save a few dollars even though it would cost them their reputation.
You ignore the facts that have been set before you in order to maintain this preposterous position:
The Air is IGZO-backplaned, it draws less current, it can use the backlighting that gives it full gamut, and the Air can be physically shrunk this year as a result, when combined with processor, software and memory bandwidth savings.
The mini is not IGZO and thus can't afford the energy for backlighting that would provide full gamut, and it uses the savings gained by processor, etc. for driving the 326 ppi display, and ends up having to enlarge case and battery.
All this can be gleaned from Soneira's reports. What we are seeing is a result of IGZO not being ready for higher-density screens.
You guys just continue to take the low road and make absurd assertions based on your preconceptions (bad greedy Apple), ignore the blindingly obvious facts, and destroy your own reputations as responsible, adult debaters.
Carry on.
Ps. I see you use the Kindle and the Nexus as rebuttal, ignoring that they are LTPS, which is unavailable to Apple in the quantity required, even if they could redesign the whole device to abandon their IGZO effort. Get real.