Best mpg lower gear at peak torque or change up?
Discussion
I've got a fabia vrs (1.9 tdi 130hp) and I always go for 4th gear at 30mph, don't know if yours is a six speeder but mine seems to sound too revvy in third, again at around 1900rpm. And it doesn't laboured in 3rd either, although obviously if you wanna accelerate at any more than a snales pace then change down a cog....or two
Edited by willmagrath on Thursday 21st November 22:04
MrsMercs currently has a Jazz iShift - auto with flappy padels. She uses it in auto but I use the flappy padels to change up earlier. I always get better mpg doing these earlier manual changes.
The gearbox is set up to provide torque on more occasions for those solely allowing the car to do the thinking.
However - totally the other way on - old Mercedes auto's with switchable economy/sport mode always seem to produce better mpg in the sport mode, holding the gears and changing later.
The gearbox is set up to provide torque on more occasions for those solely allowing the car to do the thinking.
However - totally the other way on - old Mercedes auto's with switchable economy/sport mode always seem to produce better mpg in the sport mode, holding the gears and changing later.
davepoth said:
Best fuel economy in a turbo diesel is to change up before the boost threshold; the engine simply can't take much fuel in without the turbo, and besides that BMEP is highest at low revs.
Agree 100% and borne out of experience with my 9-5 TiD.The newer style of L-driving encourages you to change up as early as possible, I find in the 208 that taking it up to around 1700-1900 RPM then changing up is the most fuel efficient if not the most friendly to the components. I'd never let the clutch 'chug-chug-chug' though for more than a second or two before changing down mind and curse myself if I ever change up too early. Most modern manuals though are EXTREMELY tolerant through the gears though compared to cars of older vintages ('90s and earlier).
Ozzie Osmond said:
Petrol car is similarly most efficient if you keep the turbo at idle. But the mystery to me is why buy a powerful car and then drive it for economy? Might as well buy an economy car and save a serious wedge!
Because often the nicer cars are fitted with the less Eco engines and if you only have one car and want a big one why not save a few £ when you're not in a hurry. Gassing Station | General Gassing | Top of Page | What's New | My Stuff