Wide tyres

Hello I would like to refer again to the experience of the people in the forum. I have on my 69er Impala front and at the rear 215/70/14 on 7 ” rims. At the moment I think about changing to only 295/50/15 to 10 ” rims. I want to leave the 215 front so. Does the 295 fit to 10 inch at all? What should be changed if not? What does the fuel consumption look like, changes strongly? Do I have to adjust to stronger wear (e.g. rear axle) and bad driving behaviour? Questions about questions Who knows more? MfG Bergmann