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Old 08-06-2019, 08:27 AM   #20 (permalink)
ratgreen
EcoModding Lurker
 
Join Date: Jan 2017
Location: UK
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Its a trade off, so depends on your normal driving.

Larger tyres requires more torque to get moving = uses more fuel to get up to speed.

Once you are up to speed then they will lower your rpm (usually better for mpg, also probably the most torque-y part of your engines powerband). They will also traverse bumps in the road better.

So they make sense if you do lots of highway driving but not if you are a city driver.
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'98 OM606 E class Merc
Running on veg oil
35mpg average (tank to tank)
225 45 17 > 215 55 17 @ 55psi
LED lights all around inc headlights
Planned: electric turbo turbine generator (WIP), EGR coolant heat exchanger, Front air dam, solar panel, lithium battery pack, alt delete, full undertray, weight reduction, block insulation, engine bay insulation.
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