Last month, I replaced my old Garmin305 with a 500. Love it except for the calorie calculation. It is very low compared to my 305 calculations, which were close to several internet references I use.
I am a 66, 5'10" and 153 lbs with a lactate threshold of 149. Yesterday, I did a 70 mi. training ride with 5850 of climbing. Avg HR was 132. The calories burned on the 500 registered 1455. My 305 registered 4510 at a 134 Avg HR on the identical ride. Internet calculations are +-3995. The error factor is consistent on all of my comparable rides. Does anyone else have the same problem? Is there a fix?