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Premium Member
451 Posts
the battery, not the motor


the motor can't weaken. But the battery can (which might cause the BCM to allow less power to be supplied to the motor).

However, when you drive up a hill full-throttle, the instantaneous mpg reading has nothing to do with the electric motor or the battery. If the engine uses more gas, the problem needs to be looked fore there!

But to compage to my car: at highway spped of 55mph, with the "pedal to the metal" in 5th, my car has always showed right around 35mpg. Are you sure you got 49mpg with full-throttle at the same speed as you are comparing to now? That would be quite impressive! I drop to 50mpg as soon as I leave lean-burn, without much pressure to the pedal at all!
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