I used to have the Sainsbury's economy wholemeal (800g and 2 slices) and cut off the crust along 1 side of 1 of the slices of bread as 2 slices weighed about 60g. They then changed the thickness of their slices so it no longer works, however have found that Morrisons wholemeal bread (75p per loaf) 2 slices weighs about 62g so I cut 2 sides of crust off and hey presto 57g and a decent sized slice!
*** Health warning *** You do need to weigh each slice
*** Health warning *** You do need to weigh each slice