I have a 2000 Chevy Tahoe- 5.3 and a 06 Silverado with a 5.3 Flex fuel?

Question:
I have a 2000 Chevy Tahoe with a 5.3 Liter Engine and I also have a 06 Chevy Silverado with a 5.3 Liter Flex Fuel engine. I noticed that the Tahoe at Freeway speeds sits at about 2,250 RPMs and the Silverado sits at about 1,750 Rpms at the same speed, The Silverado gets about 5 MPG better and was woundering if you think this RPM difference makes the MPG difference?

Answers:

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The engines are not truly an apples-apples comparison if you have the following:
1. One thing that would most likely be different is that they may have different sized rear differentials. This, may in part, deal with the RPM difference. I am surprised that your Tahoe has an RPM of 2250. I have a 2002 Tahoe that runs about 2000 at 70mph. It is also a Flex Fuel, but I have never run the E85 fuel.
2. Each car manufacturer seems to get a little better with fuel economy each year although you get better horsepower with the same sized engine.
Not sure this helped, but these have been my observations.

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By the way, the flex fuel (E85) seems to be a more expensive way of travelling. I read an article in a magazine that stated you will have to use 40% more fuel because your MPG drops. I also did the math on the lower E85 gas price per gallon and took the 40% decreased MPG into account, it looked like I would pay about 10 cents more per gallon than if I would have used regular gasoline.

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OK, I could take my tax return and buy tuner parts for my car! Is this smart?

yes, totaly

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