MB have invited me to a C350e Market Research event this weekend which has brought the inner geek out in me as I thought I'd analyse how the car has performed from an efficiency perspective so that it's green credentials could be discussed based on facts.
I've had the car for 13 months and use it to commute to work every day, which is a 36mile round trip. We do use it for longer journeys, but I have learnt that the ICE is not efficient so we tend to use our diesel vehicle for those longer trips.
I had planned to leave the trip computer for 12months without resetting it in order to keep a running tab on the numbers, but unfortunately the car suffered from the water ingress in the wiring loom which resulting in me using the ICE only for several weeks which really affected the numbers due to the poor mpg of the ICE. So these numbers are from the reset which happened at 6,265miles, but I have pro-rata'd the numbers up to create results based on my total milage to date(14,605miles).
I charge the car every night at home and occasionally charge at work. I don't have a seperate at work as I charge it off the 13amp circuit, so I have used an assumed cost.
Prior to having the C350e I had a BMW 530d Mspt, the average MPG was circa 33-35. Given that the C350e is a higher performance car I am pleased with the results, with the BIK being another bonus. My only disappointment is that the predicted electric range is overly optimistic and the external temperature plays a more significant part in the range than I had expected.
What these numbers do show is how poor the ICE is when used on its own.
Total mileage to date - 14,605 (av 1,123miles/month)
Since last mileage reset due to water ingress
Total mileage - 8,340
Electric mileage - 4,492 = 53.86%
ICE mileage - 3,848 = 46.14%
Combined MPG - 55.3
Applied to current total mileage
Total electric mileage - 14,605 @ 53.86% = 7,866
Total ICE mileage - 14,605 @ 46.14% = 6,739
kWh used at home - 2,148 @ 10.24p = £219.95
Assumed electric cost at work assumed = £40
Total electric cost = £259.95 (£19.99 per month)
Cost per mile on electric = £259.95/7,866 = 3.3p / mile
Actual ICE mpg - Hybrid MPG 55.3 less 53.86% (electric) = 25.5mpg ICE
Average Petrol price/litre over 13 month period - £1.10/ltr or £5.00/gallon
Cost per mile on ICE = £5.00 / 25.5mpg = 19.60p / mile
Total Petrol cost - 6,739 x 19.60p = £1,320.84 (£101.60 per month)
Total Hybrid fuel costs over 14,605miles =
Total Hybrid cost - £259.95 + £1,320.85 = £1,580.80 or 10.82p / mile