Latest MPG

How many miles were used to achieve both firgures Jack?

When you sau hypermiling do you include P&G or just basic stealth mode and conciencious driving?

 

<div class='quotetop'>QUOTE(JackDodge @ Nov 24 2007, 01:27 PM) [snapback]543673[/snapback]</div>

That is pretty much how I drive with the exception of the neihborhood streets near my house. In that area I will use ICE or battery power to get up to 30mph then glide to the next stop sign. So I'm not sure if that is considered pulse and glide really but it's close. lol I am stuck driving the speed limit on the other roadways though so my usual is 55mph to school or 65-70mph on the 150mile commute to work and back.

Good job man.

 

So ... what is the best anyone has done on a single tank of gas ... mpg wise, and range of miles-wise, in the hihy. I'm curious, because one of these days, I'll get a chance to set a high goal in the 400h. Gotta know what I'm up against. :thumb:

 

My best tank so far is 503 mi - but current tank is on pace to beat that by 10 - 15%, with an outside chance of 600 mi. Current tank is at 35.6 mpg (display)/34.7 est. actual.

Using EBH and radiator block and car chip to monitor coolant temps and % stealth mode. Best performance on a morning commute (17.5 mi/40 min) w/ EBH has been 50% stealth, which works out to 42.4 mpg. The first 25 min of the drive are used to fully warm up the ICE, and the final 15 min in extended S3/S4 modes. My routes are rolling hills (charge uphill/stealth downhill) with mostly flat terrain at end of commutes.

I'd have never thought it possible to get > 40 mpg from HiHy either, until I started reading posts on boards like this, trying and learning.

 

In the 400h I find that if I creep up the hills (providing traffic allows) at sub-30mph speeds, the regen / stealth down the other side gives a boost. I'm thinking this is so because charging up hills simply means you have to push a whole lot more air mass out of the way.

 

Sorry for the delay in responding. Been on the road taking our youngest on college visits. To answer your questions:

I have a three-layer approach to blocking the radiator:

a) Pipe insulation below the grille, similar to those used on Prius (see pic)
b) A 8.5" x 7.5" mouse pad on the LHS and RHS of the grille, secured with cable ties, covering almost 60%.
c) Reflective foil insulation (Home Depot part # ST16025), behind the main grille, and in front of the radiator. I had a bit leftover from insulating my hot water heater. I cut two sections, rolled it into a narrow cylinder, inserted from below, and then unwound the cylinder to lie flat against the radiator. I probably have 95% of the radiator blocked and use a Davis Car chip to record coolant temps. Additional insulation was taped to the bottom of the hood. My max temps have been between 196 and 199 F when OATs exceeded 80 F.

EBH use with the radiator block appears to have the biggest impact on average MPG in the first 7 - 8 min of my morning drive, as much as 50% better (34.5 v 23). By the end of my 35 - 40 min drive, the advantage drops to 32% (45.8 v 34.6).

My best tank (ending 5 days ago) was 601.8 mi and 35.2 mpg calc., where I was using EBH 3 hr every day for 12 days.

 

Evan, after hearing about 50lbs in your Prius tires, I'm now going to (be cringing as I) ask you what kind of pressures you run in the hyhi tires. BTW i'm putting our Prius higher then the measly 40lbs we've been running.

 

I just got my 2008 HiHY and I am only getting 25-28mpg on moderate terrain, mixed driving. I had a 2004 Prius for 4 years, loved it and learned how to get it into the 50s regularly, but I don't have much history on the HiHy. Where do I get a block heater and some kind of monitoring equip to be sure I don't overheat anything if I do some blocking on the radiator/air flow? Anything else I can try - or can you point me to the right place in the forums? Thanks so much -these forums are priceless when it comes to making green, very very green.!!

 

WOW finally someone got an EBH for the HiHy! 35 mpg is very encouraging for something that seats 7! and finally a owner that grille blocks a brand new suv you don't see that everyday!

i think the user is using a scangauge, you can monitor engine temp that way, IMO its impossible to overheat if temps are lower than 5 degrees C with a hybrid when your grille blocking... EPICALLY when your robbing heat from the engine to the passenger compartment.

so if you use the EBH, does that guarantee EV mode operation?

 

I have an 08 HiHy limited, 4x4, and I struggle to get it to 27mpg - takes a lot of care with the throttle, econ mode, I use it all. I am transitioning from an 04 Prius that I just plain ran the pants off and usually got in the high 40s to low 50s in mpg, so forgive me, but this is hard to get used to.

Where do I get a car chip to monitor temps on the 08 and can I also use an EBH for it? Has anyone tried blocking the radiator on this newer version? If there is an install for the EBH - I'd like to see it as I'm not sure about draining the block etal on this model.

Thanks to anyone who can help me get the mileage up. It's a great SUV, rides extremely well and has a much better interior appointment then the previous models.

Oh yeah - has anyone installed an extra battery in this - like where the third row seats are folded in? What a great car a plug-in HiHY would be!

Thanks everyone!
Gene

 

I guess I really would like to get mileage in the 60's. But I won't get greedy with my 50's.

 

how can the limited get lower mileage even though it weighs 150 something pounds heavier, unless your using more of the electrical features but ultimately yes all the energy does come from the gasoline tank.

jack you made a good point about being in econ mode when the gasoline engine has to fire up, at least you can idle less gas rather than more. Maybe when econ mode is on the engine knows it doesn't need to work as hard so the engine may shut down earlier?

and im pretty sure how the 3 white accelerator bars work in the way i described it at hybridchat

one bar = efficient cruising rpm
two bars = efficient acceleration rpm
three bars = efficient performance acceleration rpm

so anything above three bars, your KW demands are beyond what the efficient rpm is supported. So frictional losses and fuel enrichment modes occur. If I had to make a bet, beyond three bars is above 2300 RPM (someone with scan gauge plz confim!!!!) Also what is the KW rating when you pass the three bars? can one guess what the number rating is?

Does the N rule in the prius applies to the hihy? enigne off stays off/on

i drove one around a parking lot trying to engage ev mode... not even in 15 degrees C weather... dissapointing, and the poor thing went through 3 engine fireups, all from dead cold since it was only fired up to move a couple of feet, but since our area is small, it takes great caution not to damage a customer's vehicle.

 

so once you reach stage 4 (coolant must be 70 centigrade or 168F and you idled 7 seconds under 8 km/h and inducing engine shut off) after hybrid warm up you can invoke engine off at under 40 mph (64 km/h) right? But before that to get the engine off you would need to slow down below 40 km/h? (20 mph) and use the EV button? I'd say thats a very annoying feature on the prius as well but at least the speed limit for ev (< 55 km/h or 34 mph) makes it quicker to kill the engine when you know you can't speed up anymore (lots of downhill lets say).