Join Date: Apr 2006
location: Portland, Oregon (USA)
Drives: 2012 Elantra Limited
Mentioned: 30 Post(s)
Quoted: 75 Post(s)
Welcome to the nature of the beast, my friend. On a recent road trip, I was doing 75 on cruise control on the interstates and getting a solid 25 mpg on mostly flat ground. Just to see what would happen, I filled up, zero'd the trip meter, and drove 70 (even though the limit was 75). My mileage plummeted to 19 mpg!!! Filled up, zero'd it again, and drove 75-80. Got 24.9.
There seems to be no rhyme or reason to it. My suggestion is try it again. You may get different results second time around.
'12 Elantra Limited w/Tech - 'Emma'
Titanium Gray / Gray Leather