I have a custom Enginer system that I bought from Jack over a year ago. After three bad 3kW converters, I think the system is now finally stable. At one point I was SO FRUSTRATED with the poor component quality that I placed it up F/S on PC, luckily no one purchase it. My current PHEV spec consist of the following at the moment. - Enginer Enclosure, breaker, dash switch and mounting - Enginer 5kW 48V-240 DC-DC Inverters - 90Ah Thundersky LYP90AHA batteries (16x) - Modified ePowerCity 1000 Watt LiFePO4 charger (modified cutoff at 56.5V cutoff) - Cellog 8M (4x) configured for <2.8V & >3.8V alarm - Absolutely NO BMS :boom: Standard Prius Eco-Range Accessories - Scanguage - Coastal EV Switch - Grill block (100% upper / 50% lower) My typical daily commute is ~ 16 miles each way in Silicon Valley. 40% City & 60% Highway. Fuel economy can change as much as 10% based on the time of day due to traffic and driving style. === W/o Kit performance === Summer 50-55 mpg with 87 octane Winter 43-49 mpg with 87 octane w/o grill block === 5kW Kit ON 1st tank performance === Winter 52 mpg with 87 octane w/o grill block I received two "upgrade" 5kW converter from Jack that were pickup thru 3Prong (Berkley, CA). The first unit was not able to charge my TB pass 56% SOC :mad2:, while the second was only able to charge up to 60% SOC. I believed this was done on purpose to minimize the failure rate of the component as the original 3kW unit was able to charge pass 70% SOC. Unfortunately this also dampen the purpose of PHEV :doh:. With so little headroom the Enginer kit only improved my mpg by a measly 3 mpg. I was PISSED! After bugging Jack for the pot functionality for a week, I finally got the instruction. I adjusted my voltage cutoff to 243V and was able to charge up to 70-75 SOC. Finally I was able to achieved part of the promissed of PHEV :amen: === 5kW Kit ON performance === Winter 82 mpg with 87 octane with grill block Best 100 miles performance is 120 mpg Average speed: Scanguage 22 mph City speed target 33mph and 41mph. Non traffic highway speed is target of 65 mph Light traffic highway speed target of 33mph and 41mph Heavy traffic highway speed is < 32mph By changing when I go to work by 1 hour, my fuel economy changes shot up to 99.9+ mpg. My driving style have also been adjusted to maximize my mpg. This is what I did. 0. Charge up the traction battery to 70-73% before any trip. Since the area is pretty flat I won't don't have the risk of the Triangle of Death. 1. Maximize EV mode AMAP with speed <34 mph. I try to maintain 33 mph with < 15A draw. 2. If traffic speed is too quick, then I would step it up a not and maintain 41 mph with pulse and glide. 3. Light traffic highway speed I would try to maintain Warp Stealth at 50-52 mph Using my Coastal EV and Scanguage with constant monitoring, I'm always force EV immmediately when speed drop < 34mph & upcoming traffic congestion ahead. I'm happy with the current setup. It's fun trying to fillup once every 3 week. Especially with my work subsidizing for daily 4kWh charge (~ $0.80/day) With that said, I can not recommend this to ... say my wife for daily commute. There are just too many factors to monitor to make things goes smoothly, assuming no component failure. In term of financial investment by making it PHEV and 100% of the electricity is being subsized by my employer, I'm saving $8/week. My kit costs me $3700 (w/o tax credit) so it will take about 9 years to recoupe the cost at $3.25/gal Is it worth it? Financially probably not, but being able to drive 100 mpg and smirk at SUV, now that's $PRICELESS$ Don't feel too sorry for my mpg as my weekend drive only gets 15 mpg on it's 2900 lbs chasis.