Last few weeks I've been putting on more surface street miles than for
quite a while. Still about half my weekly miles are freeway, where I
get about 29mpg. Combined I'm getting barely 24mpg. That suggests
it's really sucking around town.
OK, I have been running up the revs a little on the surface streets.
The car seems to have three modes. Economode, not bad performance but
could be better. That's how I've been driving it for the first four
months. To the redline mode, when it moves very nicely. I'm not in
that much of a hurry, and don't believe the car will put up with a lot
of it. And the third mode is anything in between, but that often
seems really "sticky". Is it just a few excursions towards the
redline that eat the mileage? Does anyone drive Accord EX4 sedans in
| freeway, where I get about 29mpg
Without coasting ? On RON95 or 97 petrol ? Nitrogen in tyres ?
How slowly can engine idle stably w-o load ? Synthetic oil ?
My SM4 ( its F20A w-o load can now idle perfectly stably @550
rpm, injectors' voltage reduced to 3.85v, many flaws &
inadequacies corrected, EGR & ALB disabled, has long branch
4-2-1 manifold & 0.2 ohm spark cables ) with coasting on clear
highway & RON95 & nitrogen & synthetic + fullerene, now can
score 18.4 kpl ( 43.4 mpg ) in 31ēC humid air.
First point is ignore Cheah unless you are driving the van for the
loony bin in which case, pick him up.
Your mileage sounds about right if you are getting on it a little.
What do you mean by running up the rpms a little? 4000, 5000, 6000?
For the record, you can run the engine up to redline every day and it
will still be ready again at 150,000+ miles. (The transmission might
be a different story.) Try keeping the rpm between 2000 and 3000 and
be gentle on the pedal around town if you want to save gas. I am more
in the redline school of thought.
What do you mean by 'modes?' Is there a switch on the dash? If not,
it's all down to the loose nut behind the wheel.
Here's a good answer.
In short, ANTICIPATING traffic and lights will get you an instant 25%
increase in city mileage.
More significant improvements can be had by running the engine in the
efficiency 'sweet spot' when you need to accelerate. As a general rule,
best fuel efficiency, or BSFC, occurs at lower revs (20~50% of redline)
and intermediate throttle levels (40 to 75% or so). Do a search for
'bsfc map' You can exploit this by short shifting and applying a fair
amount of pedal. Don't get too close to full throttle, or the ECU will
likely richen the mix to make maximum power. Once up to cruising speed,
jump to the top gear and putt along. If you've got a stick, you can
even slip it out of gear if you're coming up on a light or can glide
down a gentle hill.
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