I have managed to exceed the manufacturers official average in nearly every car I've owned and I don't drive slow. Quite the opposite actually. Only cars I can't are the new eco diesels. My old t180 auris I simply couldn't and my prius after 3 weeks ownership I'm very close. My first full tank and I'm half way through and reading 67-68 mpg. Very close to the 70.4mpg average for the t-spirit. Over the first half tank I learnt quickly how to treat the hybrid system. I've added 10mpg onto my previous best efforts. I've experimented with slow and fast acceleration, throttle position, p&g, hill factoring, cruise and no cruise, EV forcing and EV avoidance. Probably more too. Simple principals as already mentioned is Don't try to trick the system to running on battery. Don't floor it Don't accelerate slow Don't brake at the last minute Don't p&g Don't glide just to have to accelerate again Don't glide to a stop Do glide but then go into energy recovery if stopping, maximise charge back into battery so energy is not taken from ICE Do glide downhill , avoid energy recovery here if not stopping (glide as in nothing showing on HSI) Do accelerate with reasonably quick speed, use 3/4 on HSI for flat ground quickish acceleration up to 40mph, use half way into PWR for higher speeds, gradually pulling back to 3/4 as you approach speed. Don't over speed to then glide, waste of energy especially at high speeds, you loose too much mph due to wind resistance. Therefore don't glide at speeds higher than 45mph unless it's downhill and speed can be maintained Do try to maximise the use of glide and foot off accelerator slow downs if you are approaching a junction but not at the expense of annoying people behind you. Slightly later glide and energy recovery slow down is nearly as good Do try to keep braking in energy recovery, ie not displaying full bar braking, trying to keep braking just under max to make sure you capture as much energy as possible Do try to use cruise control at every available opportunity even on slight hills For steep hills employ an approach to accelerate with 3/4 HSI before the hill, learn how much mph to go up that will allow you to bleed off speed to maintain about 50 mpg on instant readout whilst going up. Steeper longer hills might need +10mph at the foot. Very steep hills just maintain a steady throttle position. Cruise control is very effective, coupled with acceleration between 3/4 HSI (just under pwr) or going half way into pwr (before engine note changes) coupled with the most effective technique which is trying not to brake when coming to a stop (if you do use energy capture brakes), these together have produced very good mpg for me. Lifting off and forcing EV at 35 - 45mph and below is only effective for me if I know I have either a long stint at 50mph or above or I have a big regen opportunity coming up. Forcing EV and prolonging really doesn't help mileage. Just keep it in EV if you can maintain a speed that using the lower half of EV. For the borderline moments, around 40mph I typically switch between very minimal ICE usage, just over half way and glide. Glide on flat is still very effective at 40mph because there isn't as much air resistance. If I have a slight downhill I switch back to forcing EV if it doesn't come naturally as I know i can maintain speed on EV with either a glide or a tiny wedge to the left. The other thing worth mentioning is anticipation. Like with the hills use the gradients and set the speed accordingly using downhill and flats to your advantage. In town I like to use EV up to 10mph so use the cars in front to judge take off you are likely to be slower than the one immediately in front so leaving a bigger gap start rolling as you we cars in front of him start off. It's a bit of a trick but clearly you need to check the guy in front is paying attention. Also I like to use EV around roundabouts, stay in EV on the HSI and when ready immediately get into the acceleration phase. Don't slow transition it. All of that and I'm getting over 70mpg on my 25 mile mixed conditions commute. My average is bought down to 67mpg because my 1-2 mile trips are killed by the warm up process and no matter what 50-55mpg is the most I can achieve there.