[ecomodded]

I noticed the same thing with my car when Traveling slow in 5th gear, it had me contemplating if it was useless to put in it in neutral.
Sometimes even when you give it more gas the rpm does not change but more fuel is being used, for example ,when you hit a grade and give it more pedal to compensate for the drop in rpm. This is similar to idling in neutral then putting it in gear,or so I have deduced. Your car will add fuel to keep it at the minimum rpm

Somehow it still confuses me ? I may have it wrong yet..