Couple other factors that may play in.
Correct tire preasure with the new tires, a bit low with the old ? Do you check it often ? Also tale a look the DOT ratings.
300-AA-A vs 700-A-A the Nikians are rock hard, a lot less rolling resistance.
The other thing is, you need to chek the milage over a couple tanks, as there is also the placibo effect, maybe you where paying more attention to your driving habbits due to the new tires and did not realize it.
Steve
--- In
diesel_mercedes@yahoogroups.com, "JD" <jdblackwell2@...> wrote:
>
> I have 17" AMG wheels on my '92 300D which never managed to get better than 28.5 mpg either on stock wheels or on the 225/45 17 Toyo Proxess 4 tires that were recently on it. I switched to Nokian Entyres in 225/50 17 for a 3.51% increase in rolling diameter 2 weeks ago and took a road trip from Everett WA to Portland. After correcting the odometer error for the slightly larger tires I computed 35.5mpg. Now I know that part of that 25% increase is due to the greater rolling diameter (3.51%) but I find it hard to swallow that the rest came from the lower rolling resistance of the tires. They do coast much further and the amount of accelerator pedal needed to move the car is palpably less.
>
No comments:
Post a Comment