At cruise, leaned in my SS fuel flow 6.8 gph with little variation, perhaps a tenth or two. Past couple of flights, fuel flow varying by 1 gph or even a little more - from 6.8 up to 7.8 or even 8, which i don't think is real, but an error in sensor or connection. EGTs CHT Rpms are all stable. So, fuel flow varying by 1 gph, with all else being equal. Any ideas?

Thanks