Hi Ex_karls i started my fasting this way, i kept it up for a few weeks and then swapped to the 5-2 plan, for me the weight loss was the same, 2 to 3 lbs a week, but i did have an extra 100 cals extra on those 4-3 days. i do think the more weight you have to lose the faster it comes off in the early days.
wishing you every success what ever plan you use.

Please please take body Measurements, it will keep you going when things start to slow down, ive been doing this plan for ten months now and have lost 14 1/2 inches of body fat, so even when the scales may be saying no weight has gone your body shape is changing.
good luck!