I have noticed that my panel tells me I have different amounts of miles I can go before I have to fill up. Last night it read 115mi. This morning I get 85mi. What gives? Is it dependent on how the car is sitting. My driveway is sloped a little and garage is flat. I did look at it in garage after I got home this morning. Also, can someone tell me in lamens terms what CAFE regs are? I read some threads, but feeling stupid here. LMAO.

It is effected by how the car is currently being driven. Its just a guess by the computer and I wouldn't rely on it, but it is a neat feature to have if you are curious. If you are running on a highway at 65 its going to have a longer distance than if you are sitting at redlights in town.

most garage floors have a slight grade to aid draining water that may drip off of cars...CAFE is a gov't regulation saying that an automaker's fleet of cars must meet a "combined" emissions level, i.e. low-emission cars help offset high emissions of say diesel trucks, etc...

Idling will affect the mte displayed, also how driven, but example from my GP: last night we stopped at a grocery store and I left car idling wit hw. in car while I ran inside. When I parked we had 125 to e. When I came out it read 85. All that gas used averaged over zero miles driven affected it.

CAFE is a fuel economy regulation http://en.wikipedia.org/wiki/Corporate_Average_Fuel_Economy and only regulates emissions by inference. Emissions are seperately regulated by EPA, which aslo coincidentally conducts the mileage tests.

Also, can someone tell me in lamens terms what CAFE regs are? I read some threads, but feeling stupid here. LMAO.

CAFE = Corporate Average Fuel Economy. From the NHTSA web site:

"Corporate Average Fuel Economy (CAFE) is the sales weighted average fuel economy, expressed in miles per gallon (mpg), of a manufacturer’s fleet of passenger cars or light trucks with a gross vehicle weight rating (GVWR) of 8,500 lbs. or less, manufactured for sale in the United States, for any given model year. Fuel economy is defined as the average mileage traveled by an automobile per gallon of gasoline (or equivalent amount of other fuel) consumed as measured in accordance with the testing and evaluation protocol set forth by the Environmental Protection Agency (EPA)."

In the paragraph above, "sales weighted" means that manufacturers have to factor in both the mileage rating of a specific vehicle AND the number of units of that vehicle that are sold to determine how that model's economy factors into the overall fleet rating.

The current CAFE requirement for passenger cars is currently 27.5 mpg. The current CAFE requirement for light trucks is 22.2 mpg.

I hope this helps.

my bad...i thought CAFE was emissions, not mileage...