A little advice if I may ask please.
It's about miles per gallon again I'm afraid.
I have Jazz 1.3 CVT new car August 2018.
Collected 21.8.2018.
I keep a "petrol book ".....always have, mainly for MPG comparisons.
I'm a senior citizen and drive carefully and consistently trying to achieve maximum efficiency.
Last year at this time my mpg was 33.4.
This year it's just been measured on fill up at 29.0.
Nothing changed and car recently serviced.
Any ideas why the poor mpg ?
Thank you.
I wouldn't worry too much about the difference between 33.4 & 29 (that may be within the error band for the calculations), the real issue is that both figures are abysmal ! I just go by the car's computer, which typically gives me Trip A values around 55mpg over a mixed bag of in-town and open road travels, with Current Drive values as high as 70. Even allowing for the inaccuracy of the computer I'm happy with those figures.
It's tricky to try to diagnose your problem remotely because there are so many variables, but I'd recommend setting the infotainment screen to show the Current Drive to give an idea of just when you're using lots of fuel. It's surprisingly sensitive, and whilst not 100% accurate it does help in driving efficiently. Some thoughts:
Driving style. Obviously a heavy right foot is bad, but do you follow the green/blue lights on the instruments to prompt efficient driving? Not sure how that works with a CVT, but with a manual box you can get into 6th at a surprisingly low speed.
Geography; do you have lots of hills? I have a supermarket about 2 miles away up a fairly steep hill. The Current Drive display will show between 20 & 25 on arrival; on the return trip it's usually 80 or 90. So geography is important, especially on short journeys from cold.
Speed. I've been doing some longish trips west-east & return recently (A303-M3-M25-M20) with the cruise control set at the speed limit (so actual speed around 65), and I've found the stretch of 50mph limit through the M20 roadworks has a big effect on the Current Drive figures: typically 55-60mpg on entering the roadworks, 65-70 on exit a few miles later. Obviously if you can drive everywhere at a steady 40mph that'd be even better!
Weather. On my east-west trips, I find mpg eastbound is always better than the same route westbound. The only logical reason I can think of for this is the prevailing SW wind might be a factor.