Bryce1023

Has anyone tried using regular gas instead of premium. Have always put in premium however some friend uses regular and premium , switching back and forth. He reports that he doesn’t seem to be able to feel any difference.

louiechewy

I wouldn’t recommend putting Regular. It might void your warranty if something with the engine goes wrong and all they have to do is test the gasoline grade you have. Any adverse impact likely won’t manifest until longer term, I doubt you’ll see any short term difference. You’re already spending more than average American on a car, why go cheap on gas?

Bryce1023

I agree . I’ve always put the recommended fuel in my tank. It is recommended for a reason. Lesser octane than recommended translates to less performance and lower gas mileage per gallon.

Vladimir Livson

On the bright side, I found that premium gas GLB with 2L Turbo is 50% more efficient than our regular gas CR-V with 1.5L Turbo. My guess that GLB has more torque at lower RPM due to a high compression engine and you end up not flooring the gas pedal.

BSG75

I’ve noticed the same with ours. When driving on the highway I’ve seen the fuel range actually increase. I don’t remember seeing that happen on any of our other cars. So far, I’ve been really impressed with the GLB’s gas mileage.

Tirgoman

It'll run on regular but the computer will adjust things and you'll get poorer mileage and less power and the computer will remember that if anything goes bad in the engine. I don't think anything will but you bought a premium car that the factory says requires premium gas.

nynd

I think I saw a post where someone said it was their crank sensor. It's on the front of the block and not sure if this may lend itself to this issue.

Odd Piggy

My 2 indie mechanic friends say that if it says premium, use premium. Both of these guys are factory trained. I've seen TV exposés that say it's a conspiracy to get you to spend more money. Car companies are conspiring with oil companies? Really? Why would an auto manufacturer do that? That said, I'll use premium in my GLB until at least the primary 4/50 warranty is expired. I put the mid-grade in my C-250 sometimes because it's only 2 octane points lower than the recommendation, but it only saves $3.75 per tankful, so doesn't seem worth it. My old E320 manual did say that regular could be used temporarily if premium was not available. That statement doesn't seem to be in the manuals now, maybe because these cars are all direct injection and turbocharged.