my dad has an 06 lr3. run premium, the car is tuned to premium and designed for premium. its not worth problems down the road for build up and what not. you might be able to sneak in a few gallons of 91 octane with each fill though. do 75% premium and 25% mid or low grade (91 or 87) and that could work)...but don't just do regular to save a few bucks in the short term....it will catch up in the long term...
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2004 Discovery II SE7 - My Ride
2006 LR3 SE - Dad's Ride
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