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  1. Here are the calculations I've done for my parents on their comparison of a C-Max Energi and a C-Max Hybrid. Energi w/ 302A pkg: $32,969 (invoice price not including tax credit) Energi tax credit $3750 Hybrid: $28,944 Hybrid Rebate: $250 Ford Cash Offer: $750 Energi price subject to sales tax: $32,219 Energi sales tax at 6.5%: $2094.24 Hybrid price subject to sales tax: $27,944 Hybrid sales tax at 6.5%: $1816.36 Energi price premium: $4552.88 NPV of Tax Credit $3750 received 8 months after cash outlay based on a .25% APR: $3172.11 Energi price premium after tax credit: $1380.77 Assumptions Electric costs: $.135/kWh including all taxes and fees Gas costs: $3.75/gal Energi EV range: 20 miles Energi estimated real world MPG: 40 MPG Hybrid estimated real world MPG: 45 MPG Energi cost per mile Assumptions EV miles per week: 100 EV Later miles per week: 50 2/3 of total miles from wall charging kWh to fully charge: 6.5 per 20 miles Cost per 20 miles: $.88 Cost per mile EV: $0.043875 Cost per mile EV Later: $0.09375 Cost per 1000 miles: $60.48 Blended cost per mile: $0.06048 Hybrid cost per mile $.083333 Energi cost savings per mile $0.02285 EV miles to recover Energi premium = 1380.77/.049875 = 60,427 miles Based on 2/3 of total odometer miles being EV miles the odometer miles for payback is 90,641 miles If gas prices rise to $4 a gallon then the payback period is sooner. If electric costs rise at the same rate as gas prices then the payback period would be longer. As you can see, the payback period is quite long. As you can also see, there are a lot of assumptions in these calculations. I assume that gas prices will average $3.75/gal over the next 10 years or so. I also assume that their electric rates will average $.135/kWh over the next number of years. I also use the assumptions that the Hybrid will get a year-round average of 45 MPG and that the Energi will average 40 MPG in EV Later mode. I also assume that the electric usage from charging the car will average 6.5 kWh per complete charge of the battery. This should be enough to include the power used by cabin preconditioning when so desired which increases the cost of the Energi. The Hybrid would not have any cabin preconditioning. If the Hybrid were to be run to precondition the cabin then the balance would shift in favor of the Energi. I do not include the costs to install a 240V charger because that is not a given. I also do not include any costs to rewire their garage to support 120V or 240V charging because they need to rewire their house (and are planning to this year) regardless of whether they buy an NRG. In MN there are some things that don't work in favor of these calculations We have high electricity costs compared to other statesWe have lower gas prices than other statesOur cold winters lead to a higher electricity usage to precondition the Energi cabin and lower fuel economyOur relatively high sales tax increases the Energi premium by almost $300However I also made some assumptions that may not be the best predictions for future energy prices If gas prices increase at a faster rate than electricity costs then the Energi is a better deal (this seems more likely)If electricity rates increase faster than gas prices then the Hybrid is a better deal (this seems less likely)Benefits of the Energi not factored in above Warm fuzzy feeling about driving in EV mode around townTime saved on trips to the gas stationTime/money saved due to less oil changesCabin preconditioningDoes anyone else see other factors I should include? Thank you!
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