I don't have much experience with the Revcon, yet. But....

Checking the air in the tires (the tow vehicle) is a good idea. I flat
towed an offroad rig for quite a while before I figured out I was leaving it
at "trail pressure". What I do is inflate the tires to a bit over pressure,
then deflate over a period of days till the wear is noticed close to the
edge of the tread. It's a bit more complicated then that, but you can get
similar results with 2" masking tape across the tread. Test both front and
rear.

Assuming it's always been the same and the engine's not getting tired, it's
time to think of a few upgrades. I noticed MPG improvements with tuned RV
cam and intake, headers, and electronic ignition.

The EFI question brings up a lot of questions. TBI is the easiest, but SEFI
would give the best results.

Synthetic oils and lubes will help some.

With our 3 speed trannys, the diff gear ratio change (or a tire size change)
may help,

OH!!!
In some cases, a trailer's better for mileage then flat towing. A lot of
running gear moves when towing that way. Though, some vehicles are worse
then others. I had rear hub locks on the Bronco. Hook it up, unlock the 4
hubs and go. It was slick, very slick indeed.

Vehicles are very complicated and complex systems, but at the end of the day
It's all about money :)

BTW, I'd yank the H2 system. If any thing's going to help, it would be an
oxidizer (N2O for example) or water injection. I've seen no empirical data
to suggest the H2 stuff helps at all.

I feel your pain, that's for sure.

Fredric

On Wed, Jul 8, 2009 at 9:48 AM, thomas wessels <thomwessels@...>wrote:

> Dave, Marcus, Gordon... anyone with an idea, I'm pulling my hair out
> here...
>
> We have flatnose unit #71-0004. 455 Olds. I'm a light foot, 55-60 mph,
> towing a Sidekick. I have for 2 years been trying to up the mpg from 8-9. So
> far zip.
>
> It still has the Q-jet which was rebuilt and reworked so as to give us the
> leanest jetting possible (my carb guy went 3 times to a Smog Station to
> verify we were at the best numbers)
>
> We took it 8000 miles last year with the toad and averaged 9 mpg.
>
> Lately the mpg has dropped to 7-8 with the same setup.
>
> We've had the carb tweaked and worked on several times. I don't want to
> put any more 'Revcon units' into it, so I am in process of getting a Howell
> TBI fuel injection retrofit unit.
>
> I thought maybe the carb is dumping more fuel than it should, causing the
> drop in mpg.
>
> Here's the kicker...I looked at the plugs yesterday expecting to see some
> black (at least dark) residue from too much fuel - but they all looked
> evenly clean and light beige.
>
> To me that indicates that I am NOT running too rich, no?
>
> If that's so, where is my fuel mileage going? I am still getting the
> new F.I. system, but I don't think that the carb is necessarily the problem
> now.
>
> BTW: I even installed a real neat looking and well designed hydrogen
> generator after a friend got substantial mpg increase in his p/u and his
> moho from 7 to 14 mpg (same engine - Ford 460 in both).
>
> Even with this unit running, I have seen NO improvement. It just seems I
> am stuck at about 8 mpg now.
>
> Anybody put F.I. on and see better mpg? Any other stuff I can do?
>
> Thanks
>
> Thom and Kathy
> Revcon 250
> 71-0004
>
>


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