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If IPv4 and IFace MTU is 1500, the highest MTU you can get is 1476. Because:

(IFace MTU) - (IPv4 Header Size: 20) - (GRE Header Size: 4)

Line MTU - 24

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If IPv6 and IFace MTU is 1500, the highest MTU you can get is 1448. Beacause:

(IFace MTU) - (IPv6 Header Size: 48) - (GRE Header Size: 4)

Line MTU - 52

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