Well guys Ive never really cared about mileage or economy cause Im big into modding cars and well I always just figured If I want to go fast Ive got to pay.
Also I never had much to complain about with damn near 30mpg from a V8 camaro that wasnt driven very nicely at all.

Here is what Ive always notice. My best mileage is usually achieved with something like yalls pulse and glide technique. Ive always gave the car a decent amount of throttle but short shifted a ittle to get up to speeds.

I read that accelerating briskly without going WOT ws best for economy, than putting a large load on the motor by trying to accelerate really slow in a higher than normal gear.

In the camaro the difference was small but noticeable due to the flexible motor but in something way down on torque I can see this making a lot more of a differnce.

The thing I partly dont agree with though is the glide part.

Ive always slowed by leaving the car in a low gear to lay off brake wear, and I read it resulted in better mileage.

Dont know if it correct but the thought behind this was at idle the computer burned more gas trying to keep the motor alive than it did when the motor was being turned by the forward motion of the car.

Im not sure if this is always true, but I did yield best mileage in the camaro doing this, even though Id do it anyways even if it hurt mileage cause I like ot hear to exhaust

Oh and about running the high pressure in the tires, does anyone know if runflats are available in any of the common fit sizes. The increase sidewall stiffness (trust me its a ton, I weigh 185 pounds and can stand on a 275/35/18 goodyear supercar EMT runflat and the tire will have next to zero flex or give in it.

The corvette guys are seeing substansial losses in economy when switching from run flats.

Oh and P.S I work in a shop and I see tires with too much air in them come in all the time, causing wear concentrated in the center. When you are wearing tires out consioderably faster than you should to try and save some bucks at the pump are you taking into account the increase in the amount youll spend on tires, OR the degraded performance from your car, cause dont forget the point of high inflation for you hypermilers is to decrease resistance by shrinking the contact patch and with a smaller contact patch comes longer stopping distances and a decrease in handling capabilities.

 

Wow, 30mpg out of a V8 is definitely nothing to complain about! What year is your car just out of curiosity? Does it have cylinder deactivation?

That is an interesting note about run flats, I hadn't considered that before but it makes sense.

Thanks for the comment about the tire wear, we have a bunch of members on here that swear their tires don't have any unusual wear when they run super high tire pressures. Nice to see some information from someone who has a chance to see it first hand.

 

 

LOL!

I am with Sugarphreak - 30mpg from a V8 and it was an American car!!! - how much did the car weigh?

When you say over inflated what do you mean? Over inflated by how much, in comparison to the Max side wall tire pressure?

 

It is a 97 Camaro Z28. It has damn near the same six speed as the Viper just weaker parts. Double overdrive for the WIN.

It had just basic bolt ons and a dyno tune and 3.73s which werent helping (stock is 3:42) but at 80 it barely spins 2K rpms. So it gets great mileage for what it is.

Best I ever got was a 5 hour drive from san antonio to fort worth before it had the tune which was hurting mileage a little bit cause it was running lean. I managed 28.9mpg and I wasnt babying it like a grandma either, every pass called for a 3rd gear drop and WOT.
She weighes 3540 with me in it and a full tank of gas, shes always been a rather light F-body.

She has since been under the knife and she makes considerably more power now but thats a secret, I let those specs out when I finish up the new motor in the next couple of months.

Lets just say with a 23x/24x cam she can still manage a tad over 20mpg.

Notice I never said overinflated as a tire is not technically overinflated unless you exceed the manufactures maximum tire inflation specs but running considerably higher pressure in the tires over the car manufacturer's recommended specs it can lead to abnormal wear, trust me I see it all the time.

On the truck I wore out a thousand dollar set of michelins prematurely (wore down to nothing right in the middle) because the people who used to do my oil changes saw it fit to run 50 psi in them and its the truck so Im too lazy to change the oil or check the tire pressure (im better now). I wore them out in about 43K miles. The new set I have on there have a little over 57K on them, theyve been at 35 psi the whole time, and they have at another 20K in them.

On those high dollar tires I dont care if it gains me a few mpg, because them damn michelins cost to much haha. I guess if your running trash tires its not a big a deal, just remeber the only part of your car that (scrapping on lowered cars doesnt count haha) touches the ground is the tires so I dont reccomend running shitty tires.

 

I think this technique is called using DFCO, which was discussed on the forum earlier.

https://www.fitfreak.net/forums/eco-...l-economy.html

Also, IMO, I think runflats will have a signifcant effect on lighter vehicles. And those damn michelins do cost too much. But they're damn nice too. Cheap tires will do fine for non-agresssive driving though. So it all depends on the driver preferences.