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Originally Posted by Double-Trinity
A 3mpg increase in a vehice that gets 15 to begin with is actually saving more fuel than a 10mpg increase in something that gets 30mpg. This is why I think gpc (gallons/100mi) would be a more straightforward measurement system in terms of calculating cost. GM basically sees those large inefficient vehicles as an easier opportunity to save fuel in terms of total dollars, and realize cost-effectiveness, than putting similarly expensive hybrid equipment into a smaller, already more efficient vehicle. I suspect they will migrate their system down to smaller vehicles in subsequent model years.
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If I get 3 mpg more in my 15 mpg vehicle, then that's a 3/15 or 20% improvement and if I get 10 mpg more in my 30 mpg vehicle that's a 10/30 or 33% improvement. A much better % and...
Assuming I have a 10 gallon fuel tank, I get 30 more miles per tank in the 15 mpg vehicle with a 20% improvement, saving 2 gallons of fuel in the process.
Assuming I have a 10 gallon fuel tank, a 10 mpg improvement equals 100 more miles per tank in the 30 mpg vehicle, saving 3.3 gallons of fuel in the process.
That's a diff of 1.3 gallons of fuel saved in the 30 mpg vehicle vs the 15 mpg vehicle....So you would get a better fuel savings by improving the higher mpg vehicle not the other way around.
Maybe GM CEO needs to focus on replacing their engineers......
