2013 and 2014 NISMO owner, with question
 

So I purchased a 2013 370 NISMO on 15 Jan 2013, It recently got totaled on 17 April this year. My gas mileage avg 18.7 mpg, and my gauage would show appx 325 - 350 miles to a fill up. I just purchased another 370z NISMO 2014, im averaging low 17.6 mph, and a fill up shows 310 miles to the tank. A friend mentioned to disconnect my battery overnight, to let everything re-set and compute for altitude changes from Clovis NM 4,295ft to Albuquerque 5,355Ft. Does this make sense ? and are there any dangers to disconnecting battery ? other than having to reset clock, garage opener etc.. Thanks for suggestions and help