mass air flow sensor issue

What is your question?

I have had to replace the mass air flow sensor twice in less than a year. I took my vehicle into a mechanic because i'm only getting like 120mi out of a tank of gas. The service engine soon light is not on, but it will come on and off randomly and not stay on for any certain amount of time, its just very very random. So I took it in because with gas prices going up I can't keep going through gas like its water. The mechanic said it is the mass air flow sensor, yet again. Any ideas on what could be causing this? I know it is also going through batteries like crazy and not sure if the two could be caused by something. The truck only has 80k miles on it and I have had nothing but problems with it any ideas?