I’m considering Yokohama Geolandar A/T G015, Continental CrossContact AT2 in 215/75 R15.
What was your real-world km/L before vs after the upgrade?
Was the improvement in grip, comfort and stability worth the mileage drop?
I have a Jimny Manual and I’m planning an ~11-day / 3,700–4,000 km road trip starting November 3, with a mix of long highways, mountain roads and some light/off-road sections. The car will be loaded with passengers and luggage.
I’m considering two upgrades before the trip:
1. ECU Tune:
Thinking about a Code6 Stage 1, mainly for better low/mid-range torque, throttle response and highway/mountain drivability. I would keep the engine, intake and exhaust stock and go for a conservative tune rather than chasing maximum power.
2. Tyres:
I’m considering upgrading from the stock tyres to 215/75 R15 AT tyres, particularly:
Continental CrossContact AT2
Yokohama Geolandar A/T
My priorities are highway stability at 100+ km/h, better grip on mountain roads, comfort for passengers, fuel economy and some additional capability on rough/off-road sections. I don’t want to lift the Jimny or change the wheels.
For people who have actually done these upgrades:
Is Code6 Stage 1 noticeably better for low/mid-range torque and overtaking?
Any long-term issues with engine temperature, clutch, gearbox or reliability?
How much did fuel economy change after the tune?
Is 215/75 R15 a good size for a mostly-stock Jimny?
How do the CrossContact AT2 vs Geolandar A/T compare for highway noise, comfort, wet grip and off-road traction?
Does the larger AT tyre noticeably hurt acceleration or mileage?
Any rubbing or steering issues with 215/75 R15 on a stock suspension?
If you had to choose, would you do the Stage 1 tune, tyre upgrade, both, or neither before a 4,000 km trip?
Looking for real-world owner experiences, especially from people who have done long highway/mountain trips with these setups.