well the goodyear wranglers which are 235s is slightly bigger than the stock tires that were on it. therefore the the odometer is saying less miles than there actually is. according to the fancy table he posted I'm actually getting about 16-17 mpg. I just went 300 miles (according to odometer) with 20 gallons. once I get 33s I'm getting the speedo gear so I don't have to do all this math.

 

I havent come up with a concrete figure yet, but I am thinking in the neighborhood of 3-4 bills for everything welded and ground and ready for paint. That being said if the person helps I would knock it down considerably. At the least I am thinking $100 for the templates or same value in desirable trade. I am hoping to turn the rear bumpers out quick with a tire swing once I finish getting mine built and put it through testing. I will post it up in my sig when I get everything figured out

 

I believe that is what there are saying. There was a change.

 

225/75r15 = 168.75mm sidewall x 2 = 337.5mm which is 13.29 inches + 15 inch rim = diameter of 28.29 inches.

circumference = 3.14(diameter)

3.14(28.29) = 88.8306 inches per revolution

235/75r15 = 176.25mm sidewall x 2 = 352.5mm which is 13.88 inches + 15 inch rim = diameter of 28.88 inches.

3.14(28.88) = 90.6832

new distance/old distance = percent increase

90.6832/88.8306 = 102.08554259455638034641215977377 percent.

your odometer is 2% off. so 300 miles = 306 miles.

 

yeah, but what i was saying is that he doesnt what directly caused the change because so many things were changed out. shirley thinks that just that CAI will net the same gains as scott... im trying to get numbers out there for people

 

and its more like 15 mpgs... the 17 mpg figure with that googledoc is 300 miles for 18 gallons. plug in 20 gallons and it drops to 15.

 

I was just telling a friend you can find anything on the Forum. When I told him I was not expecting a lesson on gas mileage

 

I have never filled over 18 gallons. I ran it dry once and only filled 17.9 gallons into it. but as far as what I'm getting now, I forgot i put 2 gallons into it last night, so I would've used 20 gallons anyway.....darn....still at 15 mpg, lol.

 

also need to consider drag difference and weight i.e. bumpers, tools, roof racks, spares, jack, winches, sliders... when comparing vehicles or setting someone elses MPG as a goal for you

 

jesus christ guys...i leave for a few hours and all mathematical hell breaks loose....

 

lol yep! care to join in?

 

Jake's math was all wrong anyway, don't even bother with it. He didn't figure the different tread depths of the different 235/75/15 tires.

 

Thank God you showed up . I believe the youngins that got this started have left the room...LOL

 

best way to figure out exact numbers when it comes to gas is this;

fill up till the pump clicks off. next time, fill up till the pump clicks off. note how many gallons. if you add in between, it skews your numbers because you dont know how much is actually left in the tank. a half gallon can go another 8 miles depending on your mpg.

exactly. pretty much drag coefficient, rolling resistance, weight.

sorry... i cant let my skills shine?

 

**** no - I deal with math all day long, and peoples lives depend on it. I come here to get the hell away from it lol.