The standard / economy swith is located on the automatic transmission gate. It's not on all models, but if you've got it, you'll see it. It's a switch that goes up and down and has E or S on it depending on which you choose.

The economy meter is again, only on some models and indicates an estimated MPG - I'm not sure exactly which models have it, but I know we had it on the '93 500SE. It's on the dashboard dials - usually the top left I think.

In economy mode it will change up a gear earlier and in standard mode it will hold the gears longer and change later. Although if you floor it in economy mode the kickdown switch will cancel out the economy mode - I think.

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Oliver