Just wondering in the regular hybrid and it shows
700.7/477.4 EV using 13.46 gallons and 52.06 MPG...
Then this car got 16.58mpg.....that's what doesn't make sense. It took 13.46 gallons of gas to go 223.3 miles on the gas engine.
My 03 Passat 5 speed 1.8t I get 32mpg out of it.
Welcome to the world of gas-powered hybrids!
You've found one of the oddest aspects:
- you want poor mileage when the engine's running, but
- you don't want the engine running!
Think of what I call ICE mileage = (total miles - EV miles)/fuel used, as a measure of your efficiency as a driver. The lower your ICE mileage, the more energy you're getting out of the fuel when you're using fuel. The idea is based on "brake specific fuel consumption" (BSFC), a dynomometer test that looks at:
- brake means power at the dynomometer brake. In the 1960's horsepower wars, engine power was measured at the output shaft without accessories of transmission losses. It gave a higher number, useful when HP sold cars, and analogous to EPA mileage ratings today.
- specific means you're looking at energy delivered per mass of fuel, typically grams/kWH
- fuel consumption is the inverse of mileage (fuel per mile, not miles per fuel)
... but the resulting charts are not what you might expect. (Scroll down for Toyota hybrid engines, and recent VW diesels)
Minimum BSFC is found where you have high load (high power output) and low RPM (low power, because power is proprotional to torque x RPM). You get the most energy from your fuel running at low RPM - makes sense - but only when you have high load!
And this is what makes hybrids efficient - only running the gas engine when you can put high load on it. The lower your ICE mileage, the more efficient your driving style at extracting energy from the fuel.
My experience is based on having two commuting routes:
- a rural route with 12 stop lights and 6 stop signs where I average about 30 mph, door-to-door
my ICE mileage this summer was ~14.5 mpg, but
my overall mileage over this period was 56.1 mpg, becasue
I was only running the ICE 26% of the time
- a highway route with 5 stop lights and 2 stop signs where I average about 45 mph, but with 55- and 65-mph speed limits
my typical highway ICE mileage is 27 mpg, but
my overall mileage over this period was 47 mpg, because
I was running the ICE over 57% of the time
The other pertinent example is the VW TDI engine, which routinely gets high-40's in highway driving, which I can only match in the best of conditions. The last chart in the BSFC chart link is the 2.0L TDI engine, which is a good 10% more efficient than the best Toyota engine shown (presumed the Prius' Atkinson engine). Diesels have real advantages...
The one caveat to all this is RPM management. I improved my mileage 10-15% in my second year driving the C-Max because I'm doing a better job of keeping RPM down, which means slower acceleration and longer time to speed, but also more energy stored in the battery. By keeping RPM down, the longer burns don't use any more fuel, but the higher battery charge means longer EV glides.
You'll also find every hill in what you currently think of as "flat" land; use them wisely as hills are your friend!