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Old 12-17-2008, 11:51 AM   #1 (permalink)
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Turtle 2010 Porsche Carrera-35mpg

I thought this was interesting:

Porsche 911 Carrera achieves 35mpg average fuel-economy - [2009 Porsche 911] - MotorAuthority - Car news, reviews, spy shots

Nice to see what even a 345bhp sports car can achieve when driven properly. I am sure a few of you here could easily top this. It would be fun to find out!

So- if a 345hp sports car can do 35mpg- then why can't my 175bhp '06 Corolla XRS 4-banger reach 40mpg?!?

Sounds like I need to further tweak the nut behind the wheel!

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Old 12-17-2008, 12:37 PM   #2 (permalink)
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Wonder what sort of mpg you could get by hypermiling a Lotus? (Which already has the highest CAFE numbers in the US.)

I've got some free time for the next few weeks, if anyone would like to loan me one for a test :-)
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Old 12-17-2008, 02:57 PM   #3 (permalink)
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^^ As soon as I sell my Mazda 6 I am buying a MR2 Spyder (which is VERY close to being a lotus).

People report 32-35mpg with mixed driving consistantly on those things, and I bet you can probably hit 40+mpg hypermilling WITHOUT mods.

My target for that car is of 45mpg with mixed driving, after its modded (which sounds plausible).
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Old 12-17-2008, 03:05 PM   #4 (permalink)
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Don't forget those are 35 miles per Imperial gallon in the Porsche. 20% larger than US gallons. = 29 mpg US. EDIT: nope, I was wrong. Their conversion was to mpg US.

Quote:
Originally Posted by jamesqf View Post
Wonder what sort of mpg you could get by hypermiling a Lotus? I've got some free time for the next few weeks, if anyone would like to loan me one for a test :-)
Hey buddy, get in line! I've often had just that thought myself...
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Old 12-17-2008, 06:39 PM   #5 (permalink)
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So you accelerate full throttle up to say 210 mph and shut the engine off. You can probably coast a thousand miles that way.
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Last edited by Silveredwings; 12-17-2008 at 08:51 PM.. Reason: spellig
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Old 12-17-2008, 07:33 PM   #6 (permalink)
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Haha. The pulse would be fun in a car like this.

Also: I was wrong. 35 mpg was the result with US gallons.
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Old 12-18-2008, 04:19 PM   #7 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
Hey buddy, get in line! I've often had just that thought myself...
Sure you did :-) But I had my hand up first, so there!

Though what I'd really like is to take the power train from my Insight and put it in a Lotus Europa body. Maybe the next time some idiot rear-ends me...
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Old 12-18-2008, 11:03 PM   #8 (permalink)
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Quote:
Originally Posted by DieselHybrid View Post
I thought this was interesting:

So- if a 345hp sports car can do 35mpg- then why can't my 175bhp '06 Corolla XRS 4-banger reach 40mpg?!?

Sounds like I need to further tweak the nut behind the wheel!
The engine's too big( 2.2L?) on the corolla to hit forty easily, and the gearing on the xrs is too short. I don't think the AWD helps either, if you have that option.

swap in some taller gears

the 8th gen CE is the most efficient corolla to date (1998-2002) although the newest model may give it a run for the money.
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Old 12-19-2008, 08:56 AM   #9 (permalink)
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@ Tourigjm,

My '06 Corolla XRS has a 1.8 liter 2zz-ge engine co-designed by Yamaha. This powerplant employs VVTi-L and metal matrix composite construction with a rather high 11.5:1 compression ratio to rev to 8,400 rpm and produce +175bhp at 7800 rpm.

It's bullet-proof reliability and class-leading power-to-weight ratio made it the logical choice for the US Lotus Elise: 190bhp, and Exige: 240bhp.

This engine really shines in the ~2000lbs Elise. The Corolla XRS weighs a bit more at 2670lbs. (Although I have been able to reduce mine to 2590 lbs- so far).

Unfortunately, the XRS 6spd gear ratios were chosen to keep this high-revving engine "on the boil." 60mph= ~2709rpm, 70mph= ~3161rpm.

btw- the Corolla XRS is fwd only.

I have had no luck finding a replacement 6th gear to fit the C64 transmission to lower the hwy revs. Any leads?

Over the life of the vehicle I have averaged 31.7mpg- (hi/lo 36.3mpg - 28.82mpg).

I just can't seem to reach 40mpg!

Last edited by DieselHybrid; 12-19-2008 at 09:48 AM..
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Old 12-28-2008, 09:58 PM   #10 (permalink)
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Smallish displacement performance cars can return great mpg.
I've seen over 40 in a bpu+ mkiv supra.

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