Depends what you want though eh? I mean if you for instance have to drive your car to and from trackdays it would be kinda cool to have an "economy map" for pootling there and "balls out who cares about how much fuel it uses" map for ultimate lap pace.
If it's an NA motor it's not really the case - if it's mapped right, it's mapped right, all through the sites, whether you're pootling, or giving it large the engine runs efficiently and properly. No need to throw heaps of fuel at it, unless the map demands it for throttle opening, load and engine speed etc. Even then you want a stoichiometric, or slightly lean set of values for the site the engine's in at the time to make it perform optimally.
A well-mapped performance EFI motor should return good economy (although there is a balance involved obviously). Just look at the figures for BMW M cars and compare specific output:MPG.
If it's forced induction that's where you would typically up and down the boost for a turbo-nutter map and an easy-on-the-boost map. These maps would typically consume substantially different quantities of fuel, but the outputs at pretty much everything above idle would be quite different, too
Aftermarket ecu's don't have this facility unless you spend thousands. So much for a simple concept eh?
Why do you think we're using Megasquirt here? No offence meant, but you need to read up more on mapping and ECUs if you're going to engage on the subject. Even keeping up with PPC and Dave Walker's column each month will help you a lot if you want to understand this sort of stuff.
It IS a simple concept - it's just two maps. Provided the ECU has sufficient data holding capacity, it's simply a software switch. Building the map is the complex bit.
1 for a road map, mapped on the road, 2 for a wot map, mapped on the rollers
You'd never map on the road unless you have no other option (or you're tight - hi!). You can't effectively hold the car in the map sites as you can on the rollers. You also won't be able to detect the last 10-15% difference in power per map site on the road, which the rollers will pull out.
Wide Open Throttle is simply a number of sites in the map, depending on engine conditions - it's part of the same map as the 'road' map.
Not pompous, just a bit more informed and trying to help you understand what we're doing here and why and how.