New tyres.

[JockoT]

Cars in the UK have tyre pressures marked on the B pillar, and it is actually illegal to run with pressures outside the limits shown. I keep mine at the very top of spec.

[Draigflag]

Personally I find my fuel economy increases with new tyres, and the reason that is because I generally drive with performance in mind. New tyres have less grip so I generally drive slower until I'm happy with the grip levels, so that gives be an economy boost for a short period.

[LDB]

Originally Posted by JockoT

Cars in the UK have tyre pressures marked on the B pillar, and it is actually illegal to run with pressures outside the limits shown. I keep mine at the very top of spec.

So if the sticker says 28-32psi and you want to run 34psi that is illegal? Insanity.

[JockoT]

I said illegal. I may be wrong on that, but it certainly invalidates your insurance, which can be much more costly. Since 2014 all new cars sold in Europe must be fitted with tyre pressure monitoring.

[trollbait]

That is...I'll have to go with insane too.

Different tire models have different load ratings at the same pressure. The tire pressure on the car provides a certain load rating for the OEM tire. A different tire with a different load rating, or different max pressure, can have a different rating at the pressure specified by the car. One that is lower than what the manufacturer designed to car for, and could be over loaded at the car's rated gross weight.

[Draigflag]

Insurance companies will find any excuse not to pay out on a claim. When I was younger, I had Italian stripes fitted to my Abarth 500, I was told I need to inform my insurance company because my car now draws the attention of theives more. With my Peugeot, I wanted to remap it, only an extra 30-40 bhp so she's running around the 300 bhp mark. My insurance quotes jumped by 100% just for adding that mod so I didn't bother. It's this kind of greed that encourages dishonesty amongst its clients, people will just stop declaring modifications...

[accelrok]

Thanks for the insights regarding getting new tires. I was thinking of acquiring wider tires from 4WheelOnline to replace my current worn-out ones. I want to reduce the tire wearing as well. If possible, I want to replace my stock wheels too.

[JockoT]

My four new tyres were just getting worn in and my mpg was improving, when I damaged one tyre. I had to replace it, and now my mpg has slipped a bit.