Old tires engine was turning 2950 at 75mph. now 65mph rpm is 1750 can i expect 33 mpg
The information available is not good enough to make a good calculation. You need to get the different wheel rpms at the same vehicle speed and specify the fuel consumption with the smaller tires. On the info available I calculate the rpm to 1 mph which is 39.3 and 26.92 rmp/1 mph. The rpm is then 32% less with the bigger tires and therefor your fuel consumption should be 32% less than with the smaller tires. However, bigger tires cause higher fuel consumption well pulling away as well as more gearing down when driving up hill/ incline causing higher fuel consumption. So assume that you will save 25 % fuel. To reach 33 mpg - the fuel consumption with smaller tires must be at least 28.05 mpg. ( 33 x 0.85).
PS. Take the known fuel consumption with small tires and multiply with 0.85 to get and good estimate on what the consumtion will be with the bigger tires.
You might get there but I doubt it as the digger diameter wheels takes more power to turn so the throttle will be opened wider even though the rpm's are lower.
How to Perform a Basic Engine Tune-Up
http://schematicsdiagram.blogspot.com/2011/08/how-to-perform-basic-engine-tune-up.html-----------How to Increase gas mileage?
http://schematicsdiagram.blogspot.com/2011/12/how-to-increase-gas-mileage-on-2011.html----------
Adding performance chip to increase Fuel
mileage MPG?
http://technoanswers.blogspot.com/2012/01/adding-performance-chip-to-increase.html
----------This will help.Thanks.
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