03kjsport wrote:
ohh yeah, since your the one driving my jeep you would know. look dude. im useing my trip to alert me on my gas useage from a full tank. so when i refill it clearly says at the pump how much ive refilled from a full tank. i.e 4.5 gallons. this has nothing to do with an evic. and i do get 90-100 miles out of the first 4.5 gallons with a full tank. once more as i stated. i dont have an EVIC and im not talking about EVICs
No need to get hostile.
Unless your Jeep somehow violoates the laws of nature, this would apply to any vehicle. You gas tank is a sealed, pressurized system, so any volatilzed gas is limited because of the pressure. I'm not saying there isn't any.
Hell, for all I know you could be getting better mpg's, but your explaination isn't the reason why. The only thing that changes when you have less gas in the tank is the weight. Carrying less weight will increase you mpg's. So in a sealed, pressurized system, that uses a fuel pump to suck gas out of the tank, your explaination is invalid. Maybe it was windier one day, maybe the roads were wet, maybe the extra weight lowered you back end and decreased you wind resistance.
When's the last time you calibrated your odometer? Are you running stock size tires with no wear whatsoever? Are you using the same gas pump to fill up every time? Maybe one time you filled up, every single pump was busy at the same time causing the gas to flow out slower and you got you tank REALLY full. Maybe the next time you filled up you were the only one at the station and the gas flowed more quickly and cut off sooner, so you didn't get it as full. Maybe a fairy on a unicorn waved her magic wand and made the pump cut off quicker.
I run my Jeep down until it is sucking fumes. I'm averaging 17.1 mpg's in town (calculated both by the EVIC and by hand using trip miles and actual gallons put in) and 22.1 on the interstate.
The point is there are too many variables, and your equipment is too imprecise to conclude that it is an accurate measurement.
My argument wasn't with your conclusions, just your reasoning behind them.