NEW Hypermiling thread

[ProfessorX5]

You guys crack me up. This morning I kept up about 8L/100km for a good stretch on the highway. No drafting, or extreme measures, just exploited every downhill. However city driving has me at 394km at 1/4 tank

[bcredliner]

Originally Posted by racingbmwm3

The best gas mileage I ever achieved in my 318i, back before ethanol was year round, was across Washington state over 2 passes and many hills, albeit with a tailwind, 38mpg @ 80mph. Seemed like the best gas mileage was around 75mph in that car. Of course, I don't think I ever drove it below 60...so who knows.

One more tip, don't slow down for corners, ever. that's wasting gas. in fact, I think going faster through corners may* actually increase gas mileage.

*gets you closer to the people in front of you for better drafting...

So I also need to take 25mph corners at 55 so I can wear out my tires sooner, hear my wife scream, my dog yelp, have whatever is in the cupholders in my lap and draft the car in front of me like they are not going to brake for the curve---give up my supersize diet Dr. Pepper or suffer crotch shock, I would lose my Texas citizenship.

[ProfessorX5]

LOL... well, can't count this last tank, since half of it was on the old dirty air filter... topped off this morning and ready to make it happen. Was doing 28mpg most of the way on the highway this morning, at a blazing 90km/h hahaha.

I'll admit I got bored at one point and gunned it for a while to zip past all the ppl I was pissing off.

[Quicksilver]

Well, I guess we do have reasonable people who know what a waste of time this has been. Time to close this thread. .....

[ProfessorX5]

Nonsense! I'm clocking 252km at 3/4 of a tank. That's 9.1L/100km, or 25.85 mpg.

[motordavid]

That 'stat' is of little value, imo.
Run a few complete tanks, usual driving, refill a few times, do the arith, see what that mpg number is, over a few tanks.

Yes, ~26 mpg via the OBC, for a stretch... With the 5 spd you won't see that often or over time, in my 12+ yrs of driving my 3.0 5 spd, under all kinds of conditions.

[ProfessorX5]

We'll see

[Omerta]

Originally Posted by Helihover

This is something I've always wondered about. So is the FIS injecting less fuel than what is needed to idle to bring down the rpms?

Also, a car going up hill in say 5th gear @ 2000 rpms @ 75% throttle. Same car going up the same hill, same speed, in 3rd gear @ 4000 rpms @ 25% throttle. Which one is getting better fuel mileage? My thoughts are if the car is FI, it would be the 5th gear and opposite for a carbureted car.

Any thoughts?

Its a delicate balance of heat transfer, dP over the throttle plate and friction at speed. In general you would want to be between 2000 and 3000 rpm and at part load (30-60% throttle).

[Gurjit]

I get 600kms a tank
I drive all highway, 100kms a day @ 117km/hr cruise control
accelerate hard all the time

[jcp240z]

Just did a round trip, 850 mile run. Good conditions, traffic medium. Average cruising speed ~80mph ( with a few triple digit runs). I got my mileage to 15.6 per my obc.