Quote:
Originally Posted by Kingtal0n
I measured it myself. I'm not sure why the posted mpg is so low. Those stock estimates are the mpg values I get with a 5.3L V8 + 4l80e 600rwhp with spirited driving and +300lbs. It's not accurately represented.
I've never seen a factory auto ka24de do less than 25mpg combined and I am pretty sure its 28 to 29mpg highway if the car is cruising maybe 65mph instead of 80mph. I never kept the ka very long though. The sr20 I have measured mpg far more often than the KA and I know for sure 30mpg is just a standard for the 5-speed swap. The lowest I ever recorded for sr20 was 25mpg combined and this was with an engine that had over 250,000 miles and 120psi of compression across the board.
Everytime I fill the tank to the top and record the mileage, add it to a spreadsheet, average, deviation, t-test, normal distribution. Check speedo accuracy.
My quoted numbers are scientific and accurate.
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What you're describing is your anecdotal experience. I've gotten better than the EPA/manufacturer's rating myself.
However, factors like elevation, gas quality, etc are variables that can skew the final numbers. Manufacturers most likely use a secure facility to get these numbers out so they can give standardized results. To dealerships that will be selling these cars across the globe.