i seem to get more on my dad's unser bro, sumthin wrong wit d unser? and one thing dat i noticed, 4th was engage witout me noticing it. i alwiz turn the od button off to make sure iam not in 3rd gear, FYI turning it off switch the gear to 3rd max. if the gear switches down when i switch od off, i was actually in 4th.
havent tried the RM50 i filled in to the max, but seems dat iam getting more mileage then before. will post up the result later