The only thing I can tell you is with eco mods, I have been able to achieve 103 mpg tops on segments of trips and average 60-65 a tank depending on how I drive. I drive stop n go as well as down chipenham pkwy and i95 twice daily. I also cross some intersections at 4500 rpms due to quick lights.
I keep getting letters in the mail from the dealer I purchased my car from asking to buy it back on trade as their used inventory is low and they need my car. For 15 grand Ill sell you mines as is with all eco mods, t shirts, model cars, etc.
I test drove the crz, its a dog, its not really fuel efficient nor is it sporty.
Below is a list of a few of the mods I have.
Enginer 4 kilowatt PHEV, 3000k 35 watt fogs, Eco bulb highs, 4300k 35 watt low all w/relay kits, DRLs/Rear Wiper removed&rear interior gutted, Sony HU W/front speakers, Tanabe nf springs, 35% tint all around, all LED lamp replacement, 09 fit progress rear sway bar, OEM block heater, full gril block, KN Filter, Honda vent visiors, group 51 battery, home made balancer/grid charger Best/Worse MPG 103/36