We have just ordered 2 new Rize bikes. I ordered the RX model with the 1000 watt mid drive engine. Last years bikes with the same engine were 48 volt 19 amp batteries, which are decent wattage and pretty good range. Rize is trying to sell more batteries this year and I'm trying to decide whether I need a second battery. We do live in a hilly area however most of the miles will be put on will be on flater ground.....so question....if you were using lots of peddle assist....what might one expect for mileage?