I filled my tank about 2/3rds full, assuming that would last me a good while.....that was Monday. I ran out of gas Friday. I don't ride that much, maybe like a total of 5 miles. The weather here is very cold (if that makes a difference), I hit a good amount of hills, but I generally try to help pedal if the motor struggles at all. What adjustments should I make? The stupid cheap casing for the throttle cable broke apart on me already so I have it all taken apart anyway so I might as well tweak the rest of the bike.